Question: The Greatest Event in Television History is a mockumentary television series created by an American actor best known for his roll in what NBC sitcom?

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ER (TV series): ER is an American medical drama television series created by novelist and medical doctor Michael Crichton that aired on NBC from September 19, 1994, to April 2, 2009, with a total of 331 episodes spanning over 15 seasons.  It was produced by Constant c Productions and Amblin Television, in association with Warner Bros.  Television.  "ER" follows the inner life of the emergency room (ER) of fictional County General Hospital in Chicago, Illinois, and various critical issues faced by the room's physicians and staff.  The show became the longest-running primetime medical drama in American television history.  It won 23 Primetime Emmy Awards, including the 1996 Outstanding Drama Series award, and received 124 Emmy nominations, which makes it the most nominated drama program in history.  "ER" won 116 awards in total, including the Peabody Award, while the cast earned four Screen Actors Guild Awards for Outstanding Ensemble Performance in a Drama Series.

Adam Scott (actor): Adam Paul Scott (born April 3, 1973) is an American actor, comedian, director, screenwriter, producer, and podcaster.  He is best known for his role as Ben Wyatt in the NBC sitcom "Parks and Recreation".  He has also appeared as Derek in the film "Step Brothers", Henry Pollard in the Starz sitcom "Party Down", and Ed Mackenzie in the HBO series "Big Little Lies".

Chris Lilley (comedian): Christopher Daniel Lilley (born 1974–75) is an Australian comedian, television producer, actor, musician and writer.  He is a two-time winner of the Logie Award for Most Popular Actor, he is known for his creation and portrayal of several characters in the mockumentary television series "" (2005), "Summer Heights High" (2007), "Angry Boys" (2011), "" (2013) and "Jonah from Tonga" (2014).

Documentary Now!: Documentary Now!  is an American mockumentary television series on IFC, created by "Saturday Night Live" alumni Fred Armisen, Bill Hader, Seth Meyers, and director Rhys Thomas, with Armisen and Hader starring in the series and Thomas co-directing.  The series spoofs celebrated documentary films by parodying the style of each documentary with a similar, but fictitious, subject.  Helen Mirren serves as host for the series, which is executive produced by Armisen, Hader, Meyers, Thomas and "SNL" creator Lorne Michaels.  The episode "DRONEZ: The Hunt for El Chingon" premiered online on August 10, 2015, followed by the regular television premiere on August 20.  The series has been renewed through season 3.

Nirvanna the Band the Show: Nirvanna the Band the Show is a Canadian mockumentary television series created by Matt Johnson and Jay McCarrol.  It premiered on February 2, 2017 on Viceland.  It is based off the former web series of the same name.

Barrie Dunn: Barrie Dunn ( born June 5, 1952) is a Canadian actor, lawyer, film and television producer best known for his character Ray on the Canadian mockumentary television program "Trailer Park Boys".

List of Trailer Park Boys episodes: "Trailer Park Boys" is a Canadian mockumentary television series created and directed by Mike Clattenburg and a continuation of Clattenburg's 1999 film of the same name.  The series focuses on the misadventures of a group of trailer park residents, some of whom are ex-convicts, living in the fictional Sunnyvale Trailer Park in Dartmouth, Nova Scotia.

The Greatest Event in Television History: The Greatest Event in Television History is a mockumentary television series created by Adam Scott and Naomi Sablan.  The series premiered on Cartoon Network's late night programming block Adult Swim on October 12, 2012 and ended on January 23, 2014 with a total of four episodes.  Each episode originally aired independently as a special presentation, several months apart.

Ted Danson: Edward Bridge "Ted" Danson III (born December 29, 1947) is an American actor, author, and producer well known for his role as lead character Sam Malone on the NBC sitcom "Cheers" and for his role as Dr. John Becker on the CBS sitcom "Becker".  He also starred in the CBS dramas "" and "" as D.B. Russell.  He also plays a recurring role on Larry David's HBO sitcom "Curb Your Enthusiasm", starred alongside Glenn Close in legal drama "Damages", and was a regular on the HBO comedy series "Bored to Death".  In 2015 he starred as Hank Larsson in the second season of FX's black comedy-crime drama anthology "Fargo".  Since 2016, he has played the afterlife "architect" Michael in the NBC sitcom "The Good Place.

Trailer Park Boys: Trailer Park Boys is a Canadian mockumentary television series created and directed by Mike Clattenburg.  The show focuses on the misadventures of a group of trailer park residents, some of whom are ex-convicts, living in the fictional Sunnyvale Trailer Park in Dartmouth, Nova Scotia.  The television series, a continuation of Clattenburg's 1999 film of the same name, premiered on Showcase in 2001.  There have been 3 films released in the series: "", released on October 6, 2006; "", released on September 25, 2009; and "", released on April 18, 2014 after issues during production.

Supporting paragraphs: The Greatest Event in Television History Adam Scott (actor)
Answer: Parks and Recreation