SPECIAL PREMIERE: This annual special, a benefit to raise money for cancer research and treatment, arguably is as noteworthy for the breadth of its TV presence as for the depth of its guest roster. Oh, there are celebrities aplenty – tonight’s list includes musical performances by Stevie Wonder and Little Big Town, and appearances by Jennifer Garner, Jon Hamm, and Matthew McConaughey – but check out the places where you can check them out. The networks simulcasting this fundraiser include CBS, NBC, ABC, PBS, Fox, HBO, Showtime, TNT… and that’s just for starters.