Question: The arena that hosted the 2017 "Billboard" Music Awards opened  on what date?

Context paragraphs:
APRA Music Awards of 2012: The Australasian Performing Right Association Awards of 2012 (generally known as APRA Awards) are a series of related awards which include the APRA Music Awards, Art Music Awards, and Screen Music Awards.  The APRA Music Awards of 2012 was the 30th annual ceremony by the Australasian Performing Right Association (APRA) and the Australasian Mechanical Copyright Owners Society (AMCOS) to award outstanding achievements in contemporary songwriting, composing and publishing.  The ceremony was held on 28 May 2012 at the Sydney Convention and Exhibition Centre.  The Art Music Awards were introduced in 2011 to replace the Classical Music Awards (last held in 2009) and were distributed on 3 April at the Sydney Opera House.  They are sponsored by APRA and the Australian Music Centre (AMC) to "recognise achievement in the composition, performance, education and presentation of Australian music".  The Screen Music Awards were issued on 19 November by APRA and Australian Guild of Screen Composers (AGSC), which "acknowledges excellence and innovation in the genre of screen composition".

APRA Music Awards of 2006: The Australasian Performing Right Association Awards of 2006 (generally known as APRA Awards) are a series of awards which include the APRA Music Awards, Classical Music Awards, and Screen Music Awards.  The APRA Music Awards ceremony occurred on 5 June at the Sydney Four Seasons Hotel, they were presented by APRA and the Australasian Mechanical Copyright Owners Society (AMCOS).  APRA introduced two new award categories, 'Most Performed Blues & Roots Work' and 'Most Performed Urban Work'.  The Classical Music Awards were distributed in July in Sydney and are sponsored by APRA and the Australian Music Centre (AMC).  The Screen Music Awards were issued in November by APRA and Australian Guild of Screen Composers (AGSC).

APRA Music Awards of 2004: The Australasian Performing Right Association Awards of 2004 (generally known as APRA Awards) are a series of awards which include the APRA Music Awards, Classical Music Awards, and Screen Music Awards.  The APRA Music Awards ceremony occurred on 24 May at Melbourne's Regent Theatre, they were presented by APRA and the Australasian Mechanical Copyright Owners Society (AMCOS).  The Classical Music Awards were distributed in July in Sydney and are sponsored by APRA and the Australian Music Centre (AMC).  The Screen Music Awards were issued in November by APRA and Australian Guild of Screen Composers (AGSC).

APRA Music Awards of 2010: The Australasian Performing Right Association Awards of 2010 (generally known as APRA Music Awards) was the 28th annual ceremony by the Australasian Performing Right Association (APRA) to award outstanding achievements in contemporary songwriting, composing and publishing.  They are a series of awards which include the APRA Music Awards and Screen Music Awards.  The APRA Music Awards ceremony was held on 21 June at the Sydney Convention Centre, they were presented by APRA and the Australasian Mechanical Copyright Owners Society (AMCOS) and included the new category, 'Rock Work of the Year'.  A total of 12 awards were presented.  The Screen Music Awards were issued on 9 November by APRA and Australian Guild of Screen Composers (AGSC).  The 2010 Classical Music Awards were suspended and were replaced by the Art Music Awards from 2011 held in May that year.  They included jazz categories.  Art Music Awards are sponsored by APRA and the Australian Music Centre (AMC).

2017 Billboard Music Awards: The 2017 "Billboard" Music Awards was held at the T-Mobile Arena in Las Vegas on May 21, 2017.  The list of nominees was announced on April 10, 2017.  Non-televised awards were announced on "Billboard" website the same day as the main ceremony.

APRA Music Awards of 2005: The Australasian Performing Right Association Awards of 2005 (generally known as APRA Awards) are a series of awards which include the APRA Music Awards, Classical Music Awards, and Screen Music Awards.  The APRA Music Awards ceremony occurred on 30 May at the Sydney Four Seasons Hotel, they were presented by APRA and the Australasian Mechanical Copyright Owners Society (AMCOS).  The Classical Music Awards were distributed in July in Sydney and are sponsored by APRA and the Australian Music Centre (AMC).  The Screen Music Awards were issued in November by APRA and Australian Guild of Screen Composers (AGSC).

APRA Music Awards of 2007: The Australasian Performing Right Association Awards of 2007 (generally known as APRA Awards) are a series of awards which include the APRA Music Awards, Classical Music Awards, and Screen Music Awards.  The APRA Music Awards ceremony occurred on 16 June at the Sydney Hilton, they were presented by APRA and the Australasian Mechanical Copyright Owners Society (AMCOS).  The Classical Music Awards were distributed in July in Sydney and are sponsored by APRA and the Australian Music Centre (AMC).  The Screen Music Awards were issued in November by APRA and Australian Guild of Screen Composers (AGSC).

List of awards and nominations received by Wizkid: As of June 2017, Nigerian recording artist Wizkid has received a total of 43 awards from 157 nominations.  He is the recipient of two BET Awards, three Billboard Music Awards, two iHeartRadio Music Awards, one MTV Europe Music Awards, four MTV Africa Music Awards, one iHeartRadio Much Music Video Awards,two SoundCity MVP Awards, one African Pride Award, two MOBO Award, six The Headies Awards, two Channel O Music Video Awards, six Nigeria Entertainment Awards, two Ghana Music Awards, two Dynamix All Youth Awards, two City People Entertainment Awards, and a Future Award.  In addition, he has been nominated five times at the MTV Europe Music Awards, three times at the American Music Awards, once at the Grammy Awards, as well as four times at the World Music Awards.

T-Mobile Arena: T-Mobile Arena is a multi-use indoor arena on the Las Vegas Strip in Paradise, Nevada.  Opened on April 6, 2016, the arena is a joint venture between MGM Resorts International and the Anschutz Entertainment Group.

APRA Music Awards of 2011: The Australasian Performing Right Association Awards of 2011 (generally known as APRA Awards) are a series of related awards which include the APRA Music Awards, Art Music Awards, and Screen Music Awards.  The APRA Music Awards of 2011 was the 29th annual ceremony by the Australasian Performing Right Association (APRA) and the Australasian Mechanical Copyright Owners Society (AMCOS) to award outstanding achievements in contemporary songwriting, composing and publishing.  The ceremony was held on 21 June 2011 at CarriageWorks in Sydney, Australia.  The Art Music Awards were introduced in 2011 to replace the Classical Music Awards (last held in 2009) and were distributed on 3 May.  They are sponsored by APRA and the Australian Music Centre (AMC) to "recognise achievement in the composition, performance, education and presentation of Australian music".  The Screen Music Awards were issued on 14 November by APRA and Australian Guild of Screen Composers (AGSC) at the City Recital Hall, Sydney which "acknowledges excellence and innovation in the genre of screen composition".

Supporting paragraphs: 2017 Billboard Music Awards T-Mobile Arena
Answer: April 6, 2016