We all have those moments when we say “Never again will I _____,” and the second half of the sentence is filled with some regrettable experience that we’d like to forget as quickly as we made the bad decision to do it in the first place. Now Gypsy Bar (116 Boylston Street, Boston, 617.482.7799) is flipping that notion on its head and bringing the Never Before, Never Again party to Boston. DJ AM joins Montreal’s DJ YoC and Detroit’s DJ Captn20 for a party with the New York City Aerial Dancers and guitarist Sy Sylver. We’re willing to bet that never again will you get worldclass DJs from three cities, circusquality acrobatics, and a guitar-wielding rocker under one roof. The party runs from 9 p.m. to 2 a.m., and tickets ($20 in advance; $25 at the door), are available at 617.482.7799.