Saturday Night Live has been around since 1975, but has never before attempted what it’s trying to do tonight. It’s performing the show twice – once for the East Coast, and again, hours later, for the West Coast. Executive producer Lorne Michaels pulled this off successfully before, but that was with Tina Fey and Alec Baldwin, when doing a special live episode of NBC’s prime-time sitcom 30 Rock. For tonight’s “double feature” of SNL, Michaels reaches out to another SNL old hand as guest host: Jimmy Fallon. The musical guest, also performing his set twice, is Harry Styles.