The show is a musical, featuring performances from guests Jon Stewart, David Alan Grier, Rosie O' Donnell, Gloria Estefan, En Vogue, The Fugees, Kenny Loggins, Shawn Colvin, Jimmy Buffett, and The Mighty Mighty Bosstones, to celebrate Sesame Street's 30th anniversary. At the beginning of the show, Jon Stewart, the producer Prairie Dawn, and the crew for the show get stuck in a dressing rooms when the door won't open. The Muppets decide to produce the show themselves, with Elmo hosting. Meanwhile, Grover and some of the Humans get lost on the way to Radio City Music Hall, and they end up in Roswell, New Mexico, having picked up penguins and aliens as hitchhikers (thetvdb.com)