Charles Busch‘s homage to Grand Dame Guignol, “Die Mommie Die,” unspooled in campy fashion Monday night in Gotham.“I did everything I ever wanted to do with this movie: comedy, drama, I aged 20 years… and I got to kiss Jason Priestley,” trilled scribe/star Busch, channeling grand dames Bette Davis and Joan Crawford. Among those enjoying the campy fun and zippy lounge music at the Laura Belle after-party were helmer Mark Rucker, co-stars Priestley, Natasha Lyonne, Stark Sands and producer Anthony Edwards. Pic wrapped the inaugural Sundance Film Series. “My only regret is we couldn’t release this on Mother’s Day,” joked Sundance Channel prexy Larry Aidem. Guests included Kenneth Lonergan, J.Smith Cameron, B.D. Wong and Martha Plimpton.