Document:

EX-10.1

Exhibit 10.1

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE (this “First Senior Secured Notes Supplemental
Indenture”), dated as of August 25, 2005, among Penton Media, Inc., a Delaware corporation
(“Penton”), the Guarantors signatory hereto (the “Guarantors”) and U.S. Bank
National Association, as trustee (the “Trustee”), to the Indenture, dated as of March 28,
2002 (the “Senior Secured Notes Indenture”), which provided for the issuance of the 11-7/8%
Senior Secured Notes due 2007 (the “Securities”).

W I T N E S S E T H :

WHEREAS, Section 9.1 of the Senior Secured Notes Indenture provides, among other things, that
Penton and the Trustee may modify or amend the Senior Secured Notes Indenture without the consent
of the Holders of the outstanding Securities to, including, without limitation, add new Guarantors;

WHEREAS, the execution of this First Senior Secured Notes Supplemental Indenture has been duly
approved and authorized by the Board of Directors of Penton and the Guarantors and all other
necessary corporate action on the part of Penton and the Guarantors;

WHEREAS, Penton and the Guarantors have furnished, or caused to be furnished, to the Trustee,
and the Trustee has received, an Officers’ Certificate and Opinion of Counsel stating, among other
things, that this First Senior Secured Notes Supplemental Indenture is authorized or permitted by
the Senior Secured Notes Indenture;

WHEREAS, on December 17, 2002, Penton sold the outstanding shares of common stock of Streaming
Media, Inc., one of the subsidiary guarantors party to the Senior Secured Notes Indenture, to an
unaffiliated third party;

WHEREAS, on January 7, 2003, Boardwatch Incorporated, one of the subsidiary guarantors party
to the Senior Secured Notes Indenture, changed its name to PMI Two, Inc.;

WHEREAS, on April 2, 2003, PTS Delaware, Inc., one of the subsidiary guarantors party to the
Senior Secured Notes Indenture, changed its name to PMI Three, Inc.;

WHEREAS, on December 31, 2004, each of the following subsidiary guarantors party to the Senior
Secured Notes Indenture were merged with and into Penton: Stardust.com, PMI Three, Inc., Tech
Conferences, Inc., Healthwell.com, Inc. and Donohue Meehan Publishing Company;

WHEREAS, on December 31, 2004, each of the following subsidiary guarantors party to the Senior
Secured Notes Indenture were merged with and into Internet World Media, Inc., a subsidiary
guarantor party to the Senior Secured Notes Indenture: One, Inc., PMI Two, Inc. and Penton
Internet, Inc.; and

WHEREAS, Penton acquired the capital stock of DVGM & Associates, a California corporation
(“DVGM”), on August 8, 2005 and desires to add DVGM as a subsidiary guarantor under the
Senior Secured Notes Indenture.

NOW, THEREFORE, in consideration of the premises and for other good and valuable
consideration, the receipt of which is hereby acknowledged, Penton, the Guarantors and the Trustee
mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

ARTICLE 1

Agreement

Section 1.1 Definitions. Capitalized terms used but not otherwise defined in this
First Senior Secured Notes Supplemental Indenture have the meanings ascribed thereto in the Senior
Secured Notes Indenture.

Section 1.2 Additional Guarantor. DVGM shall be (i) a Guarantor under the Senior
Secured Notes Indenture and (ii) bound by and subject to the terms and conditions of the Senior
Secured Notes Indenture applicable to a Guarantor.

Section 1.3 Former Guarantors. The Trustee acknowledges that each of the following
former subsidiary guarantors of the Securities no longer exists and has no further obligations
under the Senior Secured Notes Indenture: Stardust.com, PMI Three, Inc. (formerly known as PTS
Delaware, Inc.), Tech Conferences, Inc., Healthwell.com, Inc., Donohue Meehan Publishing Company,
One, Inc., PMI Two, Inc. (formerly known as Boardwatch, Incorporated) and Penton Internet, Inc.
The Trustee also acknowledges that Streaming Media, Inc. is no longer a subsidiary guarantor of the
Securities and has no further obligations under the Senior Secured Notes Indenture.

Section 1.4 Trustee’s Acceptance. The Trustee hereby accepts this First Senior
Secured Notes Supplemental Indenture and agrees to perform the same under the terms and conditions
set forth in the Senior Secured Notes Indenture.

ARTICLE 2

Miscellaneous

Section 2.1 Effect of Supplemental Indenture. Upon the execution and delivery of this
First Senior Secured Notes Supplemental Indenture by Penton, the Guarantors and the Trustee, the
Senior Secured Notes Indenture shall be supplemented in accordance herewith, and this First Senior
Secured Notes Supplemental Indenture shall form a part of the Senior Secured Notes Indenture for
all purposes, and every Holder of Securities heretofore or hereafter authenticated and delivered
under the Senior Secured Notes Indenture shall be bound thereby.

Section 2.2 Senior Secured Notes Indenture Remains in Full Force and Effect. Except
as supplemented hereby, all provisions in the Senior Secured Notes Indenture shall remain in full
force and effect.

Section 2.3 Senior Secured Notes Indenture and First Senior Secured Notes Supplemental
Indenture Construed Together. This First Senior Secured Notes Supplemental Indenture is an
indenture supplemental to and in implementation of the Senior Secured Notes Indenture, and the
Senior Secured Notes Indenture and this First Senior Secured Notes Supplemental Indenture shall
henceforth be read and construed together.

Section 2.4 Conflict with Trust Indenture Act. If any provision of this First Senior
Secured Notes Supplemental Indenture limits, qualifies or conflicts with any provision of the TIA
that is required or deemed under the TIA to be part of and govern any provision of this First
Senior Secured Notes Supplemental Indenture, such provision of the TIA shall control. If any
provision of this First Senior Secured Notes Supplemental Indenture modifies or excludes any
provision of the TIA that may be so modified or excluded, the provision of the TIA shall be deemed
to apply to the Senior Secured Notes Indenture as so modified or to be excluded by this First
Senior Secured Notes Supplemental Indenture, as the case may be.

Section 2.5 Severability. In case any provision in this First Senior Secured Notes
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 2.6 Benefits of First Senior Secured Notes Supplemental Indenture. Nothing in
this First Senior Secured Notes Supplemental Indenture or the Securities, express or implied, shall
give to any Person, other than the parties hereto and thereto and their successors hereunder and
thereunder and the Holders of the Securities, any benefit of any legal or equitable right, remedy
or claim under the Senior Secured Notes Indenture, this First Senior Secured Notes Supplemental
Indenture or the Securities.

Section 2.7 Successors. All agreements of Penton in this First Senior Secured Notes
Supplemental Indenture shall bind its successors. All agreements of the Trustee in this First
Senior Secured Notes Supplemental Indenture shall bind its successors.

Section 2.8 Certain Duties and Responsibilities of the Trustee. In entering into this
First Senior Secured Notes Supplemental Indenture, the Trustee shall be entitled to the benefit of
every provision of the Senior Secured Notes Indenture and the Securities relating to the conduct or
affecting the liability or affording protection to the Trustee, whether or not elsewhere herein so
provided.

Section 2.9 Governing Law. This First Senior Secured Notes Supplemental Indenture
shall be governed by, and construed in accordance with, the laws of the State of New York, but
without giving effect to applicable principles of conflicts of law to the extent that the
application of the laws of another jurisdiction would be required thereby.

Section 2.10 Multiple Originals. The parties may sign any number of copies of this
First Senior Secured Notes Supplemental Indenture, each of which shall be deemed an original, but
all of which together shall constitute one and the same instrument.

Section 2.11 Headings. The Article and Section headings herein are inserted for
convenience of reference only, are not intended to be considered a part hereof and shall not modify
or restrict any of the terms or provisions hereof.

Section 2.12 The Trustee. The Trustee shall not be responsible in any manner for or
in respect of the validity or sufficiency of this First Senior Secured Notes Supplemental Indenture
or for or in respect of the recitals contained herein, all of which are made by Penton and the
Guarantors.

1

IN WITNESS WHEREOF, the parties hereto have caused this First Senior Secured Notes
Supplemental Indenture to be duly executed as of the date first written above.

PENTON MEDIA, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

INTERNET WORLD MEDIA, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

DUKE INVESTMENTS, INC.

By:

Name: Preston L. Vice

Title: Secretary

DUKE COMMUNICATIONS INTERNATIONAL, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

DVGM & ASSOCIATES

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

U.S. BANK NATIONAL ASSOCIATION,

as trustee

By: /s/ Richard Prokosch

Name: Richard Prokosch

Title: Vice President

2EX-10.2

Exhibit 10.2

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE (this “First Senior Subordinated Notes Supplemental
Indenture”), dated as of August 25, 2005, among Penton Media, Inc., a Delaware corporation
(“Penton”), the Guarantors signatory hereto (the “Guarantors”), The Bank of New
York Trust Company, N.A., a national banking association, as successor trustee (the
“Trustee” or “Successor Trustee”), and The Bank of New York, a New York banking
corporation, as resigning trustee (the “Trustee” or the “Resigning Trustee”), to
the Indenture, dated as of June 28, 2001 (the “Senior Subordinated Notes Indenture”), which
provided for the issuance of the 10.375% Senior Subordinated Notes due 2011 (the
“Securities”).

W I T N E S S E T H :

WHEREAS, Section 9.1 of the Senior Subordinated Notes Indenture provides, among other things,
that Penton and the Trustee may modify or amend the Senior Subordinated Notes Indenture without the
consent of the Holders of the outstanding Securities to, including, without limitation, add new
Guarantors;

WHEREAS, the execution of this First Senior Subordinated Notes Supplemental Indenture has been
duly approved and authorized by the Board of Directors of Penton and the Guarantors and all other
necessary corporate action on the part of Penton and the Guarantors;

WHEREAS, Penton and the Guarantors have furnished, or caused to be furnished, to the Trustee,
and the Trustee has received, an Officers’ Certificate and Opinion of Counsel stating, among other
things, that this First Senior Subordinated Notes Supplemental Indenture is authorized or permitted
by the Senior Subordinated Notes Indenture;

WHEREAS, on December 17, 2002, Penton sold the outstanding shares of common stock of Streaming
Media, Inc., one of the subsidiary guarantors party to the Senior Subordinated Notes Indenture, to
an unaffiliated third party;

WHEREAS, on January 7, 2003, Boardwatch Incorporated, one of the subsidiary guarantors party
to the Senior Subordinated Notes Indenture, changed its name to PMI Two, Inc.;

WHEREAS, on April 2, 2003, PTS Delaware, Inc., one of the subsidiary guarantors party to the
Senior Subordinated Notes Indenture, changed its name to PMI Three, Inc.;

WHEREAS, on December 31, 2004, each of the following subsidiary guarantors party to the Senior
Subordinated Notes Indenture were merged with and into Penton: Stardust.com, PMI Three, Inc., Tech
Conferences, Inc., Healthwell.com, Inc. and Donohue Meehan Publishing Company;

WHEREAS, on December 31, 2004, each of the following subsidiary guarantors party to the Senior
Subordinated Notes Indenture were merged with and into Internet World Media, Inc., a subsidiary
guarantor party to the Senior Subordinated Notes Indenture: One, Inc., PMI Two, Inc. and Penton
Internet, Inc.;

WHEREAS, Penton acquired the capital stock of DVGM & Associates, a California corporation
(“DVGM”), on August 8, 2005 and desires to add DVGM as a subsidiary guarantor under the
Senior Subordinated Notes Indenture;

WHEREAS, Section 7.8 of the Senior Subordinated Notes Indenture provides that the Trustee may
at any time resign by giving written notice of such resignation to the Company, effective upon the
acceptance by a successor Trustee of its appointment as a successor Trustee;

WHEREAS, Section 7.8 of the Senior Subordinated Notes Indenture provides that, if the Trustee
shall resign, Penton shall promptly appoint a successor Trustee;

WHEREAS, Section 9.1 of the Senior Subordinated Notes Indenture provides that any successor
Trustee appointed in accordance with the Senior Subordinated Notes Indenture shall execute,
acknowledge and deliver to Penton and to its predecessor trustee an instrument accepting such
appointment under the Senior Subordinated Notes Indenture, and thereupon the resignation of the
predecessor Trustee shall become effective and such successor Trustee, without any further act,
deed or conveyance, shall become vested with all rights, powers, duties and obligations of the
predecessor trustee;

WHEREAS, pursuant to Section 2.3 of the Senior Subordinated Notes Indenture, the Resigning
Trustee was appointed Registrar and Paying Agent;

WHEREAS, Penton desires to appoint the Successor Trustee as Trustee, Paying Agent and
Registrar to succeed Resigning Trustee in such capacities under the Senior Subordinated Notes
Indenture; and

WHEREAS, the Successor Trustee is willing to accept such appointment as successor Trustee,
Paying Agent and Registrar under the Senior Subordinated Notes Indenture.

NOW, THEREFORE, in consideration of the premises and for other good and valuable
consideration, the receipt of which is hereby acknowledged, Penton, the Guarantors, the Resigning
Trustee and the Successor Trustee mutually covenant and agree for the equal and ratable benefit of
the Holders as follows:

ARTICLE 1

Agreement

Section 1.1 Definitions. Capitalized terms used but not otherwise defined in this
First Senior Subordinated Notes Supplemental Indenture have the meanings ascribed thereto in the
Senior Subordinated Notes Indenture.

Section 1.2 Additional Guarantor. DVGM shall be (i) a Guarantor under the Senior
Subordinated Notes Indenture and (ii) bound by and subject to the terms and conditions of the
Senior Subordinated Notes Indenture applicable to a Guarantor.

Section 1.3 Former Guarantors. The Trustee acknowledges that each of the following
former subsidiary guarantors of the Securities no longer exists and has no further obligations
under the Senior Subordinated Notes Indenture: Stardust.com, PMI Three, Inc. (formerly known as
PTS Delaware, Inc.), Tech Conferences, Inc., Healthwell.com, Inc., Donohue Meehan Publishing
Company, One, Inc., PMI Two, Inc. (formerly known as Boardwatch, Incorporated) and Penton Internet,
Inc. The Trustee also acknowledges that Streaming Media, Inc. is no longer a subsidiary guarantor
of the Securities and has no further obligations under the Senior Subordinated Notes Indenture.

Section 1.4 Trustee’s Acceptance. The Trustee hereby accepts this First Senior
Subordinated Notes Supplemental Indenture and agrees to perform the same under the terms and
conditions set forth in the Senior Subordinated Notes Indenture.

ARTICLE 2

Resignation, Appointment and Acceptance

Section 2.1 Resigning Trustee. Pursuant to Section 7.8 of the Senior Subordinated
Notes Indenture, the Resigning Trustee hereby notifies Penton that the Resigning Trustee is hereby
resigning as Trustee, Paying Agent and Registrar under the Senior Subordinated Notes Indenture.

Section 2.2 Penton. Penton hereby accepts the resignation of the Resigning Trustee as
Trustee, Paying Agent and Registrar under the Senior Subordinated Notes Indenture and hereby
appoints the Successor Trustee as Trustee, Paying Agent and Registrar under the Senior Subordinated
Notes Indenture to succeed to, and hereby vests the Successor Trustee with, all the rights, powers,
duties and obligations of the Resigning Trustee under the Senior Subordinated Notes Indenture with
like effect as if originally named as Trustee, Paying Agent and Registrar in the Senior
Subordinated Notes Indenture.

Section 2.3 Successor Trustee. The Successor Trustee hereby accepts its appointment
as successor Trustee, Paying Agent and Registrar under the Senior Subordinated Notes Indenture and
accepts the rights, powers, duties and obligations of the Resigning Trustee as Trustee, Paying
Agent and Registrar under the Senior Subordinated Notes Indenture, upon the terms and conditions
set forth therein, with like effect as if originally named as Trustee, Paying Agent and Registrar
under the Senior Subordinated Notes Indenture.

ARTICLE 3

Miscellaneous

Section 3.1 Effect of Supplemental Indenture. Upon the execution and delivery of this
First Senior Subordinated Notes Supplemental Indenture by Penton, the Guarantors and the Trustee,
the Senior Subordinated Notes Indenture shall be supplemented in accordance herewith, and this
First Senior Subordinated Notes Supplemental Indenture shall form a part of the Senior Subordinated
Notes Indenture for all purposes, and every Holder of Securities heretofore or hereafter
authenticated and delivered under the Senior Subordinated Notes Indenture shall be bound thereby.

Section 3.2 Senior Subordinated Notes Indenture Remains in Full Force and Effect.
Except as supplemented hereby, all provisions in the Senior Subordinated Notes Indenture shall
remain in full force and effect.

Section 3.3 Senior Subordinated Notes Indenture and First Senior Subordinated Notes
Supplemental Indenture Construed Together. This First Senior Subordinated Notes Supplemental
Indenture is an indenture supplemental to and in implementation of the Senior Subordinated Notes
Indenture, and the Senior Subordinated Notes Indenture and this First Senior Subordinated Notes
Supplemental Indenture shall henceforth be read and construed together.

Section 3.4 Conflict with Trust Indenture Act. If any provision of this First Senior
Subordinated Notes Supplemental Indenture limits, qualifies or conflicts with any provision of the
TIA that is required or deemed under the TIA to be part of and govern any provision of this First
Senior Subordinated Notes Supplemental Indenture, such provision of the TIA shall control. If any
provision of this First Senior Subordinated Notes Supplemental Indenture modifies or excludes any
provision of the TIA that may be so modified or excluded, the provision of the TIA shall be deemed
to apply to the Senior Subordinated Notes Indenture as so modified or to be excluded by this First
Senior Subordinated Notes Supplemental Indenture, as the case may be.

Section 3.5 Severability. In case any provision in this First Senior Subordinated
Notes Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 3.6 Benefits of First Senior Subordinated Notes Supplemental Indenture.
Nothing in this First Senior Subordinated Notes Supplemental Indenture or the Securities, express
or implied, shall give to any Person, other than the parties hereto and thereto and their
successors hereunder and thereunder and the Holders of the Securities, any benefit of any legal or
equitable right, remedy or claim under the Senior Subordinated Notes Indenture, this First Senior
Subordinated Notes Supplemental Indenture or the Securities.

Section 3.7 Successors. All agreements of Penton in this First Senior Subordinated
Notes Supplemental Indenture shall bind its successors. All agreements of the Trustee in this
First Senior Subordinated Notes Supplemental Indenture shall bind its successors.

Section 3.8 Certain Duties and Responsibilities of the Trustee. In entering into this
First Senior Subordinated Notes Supplemental Indenture, the Trustee shall be entitled to the
benefit of every provision of the Senior Subordinated Notes Indenture and the Securities relating
to the conduct or affecting the liability or affording protection to the Trustee, whether or not
elsewhere herein so provided.

Section 3.9 Governing Law. This First Senior Subordinated Notes Supplemental
Indenture shall be governed by, and construed in accordance with, the laws of the State of New
York, but without giving effect to applicable principles of conflicts of law to the extent that the
application of the laws of another jurisdiction would be required thereby.

Section 3.10 Multiple Originals. The parties may sign any number of copies of this
First Senior Subordinated Notes Supplemental Indenture, each of which shall be deemed an original,
but all of which together shall constitute one and the same instrument.

Section 3.11 Headings. The Article and Section headings herein are inserted for
convenience of reference only, are not intended to be considered a part hereof and shall not modify
or restrict any of the terms or provisions hereof.

Section 3.12 The Trustee. The Trustee shall not be responsible in any manner for or
in respect of the validity or sufficiency of this First Senior Subordinated Notes Supplemental
Indenture or for or in respect of the recitals contained herein, all of which are made by Penton
and the Guarantors.

1

IN WITNESS WHEREOF, the parties hereto have caused this First Senior Subordinated Notes
Supplemental Indenture to be duly executed as of the date first written above.

PENTON MEDIA, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

INTERNET WORLD MEDIA, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

DUKE INVESTMENTS, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

DUKE COMMUNICATIONS INTERNATIONAL, INC.

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

DVGM & ASSOCIATES

By: /s/ Preston L. Vice

Name: Preston L. Vice

Title: Secretary

THE BANK OF NEW YORK

as resigning trustee

By: /s/ Van K. Brown

Name: Van K. Brown

Title: Vice President

THE BANK OF NEW YORK TRUST COMPANY, N.A.

as successor trustee

By: /s/ Roxanne Ellwanger

Name: Roxanne Ellwanger

Title: Assistant Vice President

2

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