'Saturday Night Live' 40th Anniversary Show: Live Stream Information, When And Where To Watch #SNL40 [CELEBRITY GUEST LIST]

SNL 40 livestream where to watch — James Franco is just one of many celebrities scheduled to appear in the "Saturday Night Live 40th Anniversary Special" Sunday, Feb. 15, 2015. NBC

“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.

"Together again... Gee, it's good to be together again" #SNL40
— *NSYNC (@NSYNC) February 14, 2015

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_tour there will not be- but can't wait to see this show!
— Lance Bass (@LanceBass) February 14, 2015

’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”: