“GOSSIP GIRL” — (8:00-9:00 p.m. ET) “The Big Sleep No More” (TV-) (HDTV) GOSSIP GIRL FILMS AT THE MUCH-TALKED-ABOUT THEATER EXPERIENCE “SLEEP NO MORE” — Several of our favorite Upper East Siders attend a performance of Punchdrunk’s provocative theater experience, “Sleep No More,” which translates to masks, anonymity and some surprising romantic twists by the end of the evening. Meanwhile, Diana (guest star Elizabeth Hurley) sets her sights on Serena (Blake Lively) in her quest to ruin Gossip Girl. Dan (Penn Badgley) is out on his book tour, but things aren’t exactly as they appear to his friends and family. Leighton Meester, Chace Crawford, Ed Westwick, Kaylee DeFer, Kelly Rutherford and Matthew Settle also star. Andy Wolk directed the episode written by Dan Steele (#507).