Sunita Williams, a NASA astronaut, is to perform the experiments, which will be broadcast online.
Prizes will be handed out at a star-studded ceremony at London's O2 Arena which will be broadcast on ITV.
In the British edition, which will be broadcast on Christmas Eve on BBC1, the bunnies will have English accents.
For the crowds outside, officials said they would set up monitors to watch the proceedings, which will be broadcast nationwide.
That Smith celebration, which will be broadcast on April 19 on PBS, packed a memorably focused emotional punch.
This matinee is also a Live in HD performance, which will be broadcast to movie theaters internationally.
Tonight's show, which will be broadcast live on BBC1, has a potential global TV audience of 120 million.
The ad, which will be broadcast in New Hampshire through Sunday, then cuts to Mr. Romney on the campaign trail.
The goalie is expected to start the game, which will be broadcast live at 1 p.m. Eastern on MSG Network.
Production is due to start on the TV series, which will be broadcast on the American channel Starz, this spring.
But the decision angered many Cuban-Americans, who planned to protest the event, which will be broadcast live on CBS.
