“Saturday Night Live” is giving fans more programming than ever to celebrate its 40th anniversary. With four hours and 30 minutes of television, the NBC institution is trying to find time for all of the celebrities and “SNL” alumni attending the Feb. 15 show.

Sunday at 7 p.m. EST, the “SNL 40th Red Carpet Special” will be rolled out. Matt Lauer, Savannah Guthrie, Al Roker and Carson Daly will co-host the event which will likely feature many of the guests who will be seen on the actual show. At 8 p.m. EST, the “Saturday Night Live 40th Anniversary Special” will begin: It was originally planned to end at 11 p.m., but it will now go to 11:30 p.m.m making it three hours and 30 minutes long. Viewers can watch the show at NBC or via live stream at NBC.com. Click HERE for another live stream option that doesn't require service provider information.

Why add an extra half hour to an already-lengthy event? “An industry observer said that with the show running long, [the] brass did not want to make cuts that could insult some ‘SNL’ alums,” Deadline reported.

Some alumni are a little scared to return to the show that launched their careers. Adam Sandler noted he was looking forward to reuniting with his colleagues, but that he was feeling the pressure. “I’m kinda nervous about that,” Sandler told Access Hollywood. “That’s weird. It’s gonna be great seeing everybody, but that’s gonna be a big night.”

It isn’t just alumni who the show has to make room for. Many guest hosts and performers are planning to make appearances, as well. Among the celebrities making cameos are ’NSync and the Backstreet Boys, Entertainment Weekly confirmed. While Justin Timberlake had been expected at the event, ’NSync’s reunion wasn’t announced until the day before the show via its official Twitter account.

However, the boy band won’t be singing. Lance Bass revealed via Twitter that while he and his bandmates will appear, they aren’t performing.

’NSync is unlikely to be the only band appearing without a musical performance. Many other musicians -- such as Arcade Fire, Fiona Apple, Elvis Costello, Keith Richards and 50 Cent -- will be around. Even with the show running three and a half hours, however, they won’t all be able to perform. Still they will make it in the 40th anniversary show somehow.

What will they be doing exactly? It’s unclear. “SNL” is keeping the content of the sketches on the show a secret, but announcements of celebrity cameos have audiences very excited. Expect plenty of guest appearances. According to Entertainment Weekly, E Online and Today, the following celebrities will show up for the “Saturday Night Live 40th Anniversary Special”:

  • 50 Cent
  • Adam Sandler
  • Aidy Bryant
  • Al Franken
  • Alec Baldwin
  • Amy Poehler
  • Andy Samberg
  • Ana Gasteyer
  • Arcade Fire
  • Backstreet Boys
  • Beck Bennett
  • Betty White
  • Bill Hader
  • Bill Murray
  • Billy Crystal
  • Bobby Moynihan
  • Bradley Cooper
  • Candice Bergen
  • Catherine Zeta-Jones
  • Cecily Strong
  • Charlie Day
  • Cheri Oteri
  • Chevy Chase
  • Chris Kattan
  • Chris Parnell
  • Chris Rock
  • Christopher Walken
  • Colin Jost
  • Colin Quinn
  • Dakota Johnson
  • Dan Aykroyd
  • Dana Carvey
  • Darrell Hammond
  • David Koechner
  • David Spade
  • Deborah Harry
  • Derek Jeter
  • Diddy
  • Eddie Murphy
  • Edward Norton
  • Ellen Cleghorne
  • Elliott Gould
  • Elvis Costello
  • Emma Stone
  • Fiona Apple
  • Fred Armisen
  • Garrett Morris
  • George Lucas
  • Glenn Close
  • Gilbert Gottfried
  • Governor Sarah Palin
  • Haim
  • Horatio Sanz
  • J.B. Smoove
  • J.K. Simmons
  • Jack Nicholson
  • Jack White
  • James Franco
  • Jane Curtin
  • Jason Sudeikis
  • Jay Pharaoh
  • Jerry Seinfeld
  • Jim Carrey
  • Jimmy Fallon
  • Joe Piscopo
  • John Goodman
  • Johnny Knoxville
  • Jon Bon Jovi
  • Jon Lovitz
  • Julia Sweeney
  • Justin Timberlake
  • Kanye West
  • Kate McKinnon
  • Kings of Leon
  • Keith Richards
  • Kenan Thompson
  • Kevin Nealon
  • Kerry Washington
  • Kristen Wiig
  • Kyle Mooney
  • Laraine Newman
  • Larry David
  • Leslie Jones
  • Louis C.K.
  • Ludacris
  • Martin Short
  • Mayor Rudy Giuliani
  • Maya Rudolph
  • Melissa McCarthy
  • Michael Bolton
  • Michael Che
  • Michael Douglas
  • Mike Myers
  • Miley Cyrus
  • Norm Macdonald
  • Molly Shannon
  • ’NSync
  • Paul McCartney
  • Paul Rudd
  • Paul Simon
  • Pete Davidson
  • Peyton Manning
  • Rachel Dratch
  • Rob Schneider
  • Robert De Niro
  • Sarah Silverman
  • Sasheer Zamata
  • Sean Hayes
  • Senator Al Franken
  • Seth Meyers
  • Sigourney Weaver
  • Steve Martin
  • Steven Spielberg
  • Taran Killam
  • Taylor Swift
  • Tim Meadows
  • Tina Fey
  • Tom Hanks
  • Vanessa Bayer
  • Victoria Jackson
  • Will Ferrell
  • Will Forte
  • Whoopi Goldberg
  • Zach Galifianakis