The ceremony’s pre-show starts at 1900 GMT on Sunday, with the main ceremony at 2000 GMT, which is scheduled to last up to three hours. For those in the U.S., that converts to 3:00 p.m. EDT and 4:00 p.m. EDT, respectively.
NBC will still broadcast the ceremonies tape-delayed, that evening.
Live coverage of the closing ceremonies might strain NBC's servers. It's already known that George Michael, Muse and Ed Sheeran will perform. The acts have broken the code of silence about the event and have already confirmed they will be taking part in the spectacle that concludes the 2012 Summer Olympics.
There are still other reasons that NBC's servers might be hammered though, and five of them, in fact. It's rumored that the Spice Girls may be participating in the ceremonies. Just last week, Victoria Beckham tweeted a picture of a microphone, saying “Look what I found!"
The opening ceremony was watched by 40.7 million viewers. NBC has since discovered that despite streaming all of the Olympic sports events live, its prime-time ratings have been unaffected. In fact, its viewership has been unexpectedly larger than the 2008 Beijing Games.
NBC stressed, however, that Sunday's video stream of the closing ceremonies was an experiment. It doesn't necessarily mean, the network said, that the same policy would be in place for the 2014 Winter Games in Sochi, Russia.
The stream is available to cable and satellite customers who go to the NBCOlympics.com website. Remember, you have to login with the username and password for your TV provider.