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This article was published 3/12/2013 (1100 days ago), so information in it may no longer be current.
Christmas in Rockefeller Center
Celebrity guests perform traditional and modern holiday favourites as New Yorkers enjoy the official kickoff of the season. In what has become an annual tradition, the special features the lighting of the world's most famous Christmas tree. NBC, 7 p.m.
One entrepreneur rides circles around the Dragons with an electric demonstration in this new episode. Also, another pitch leaves the would-be investors with a lot to digest, while another business has customers drooling. CBC, 8 p.m.
Hunt for a Supercomet
Dr. Dan Riskin hosts this one-hour special about the elusive comet ISON, a sungrazer set to slingshot around the sun. Scientists, astronomers and amateur stargazers talk about the comet, which could be the brightest one to ever be observed from Earth. Discovery, 6 p.m.
George Stroumboulopoulos: Amy Tan
Jay Leno: Melissa McCarthy, Andy Cohen
David Letterman: Woody Harrelson, David Ortiz
Jimmy Kimmel: Benedict Cumberbatch, R. Kelly
Craig Ferguson: Aisha Tyler, Bruce McCall
Jimmy Fallon: Orlando Bloom, Elvis Costello
Conan O'Brien: Ben Stiller, Evangeline Lilly