Bust out your favorite leggings, throw on your neon off-the-shoulder top, and head back to 1984 at Oliver’s (Cask ’n Flagon, 62 Brookline Avenue, Boston, 617.536.4840). This weekly celebration of the Decade of Decadence (and bad hair and fantastically hideous fashion) happens every Saturday night beginning at 10 p.m. and features DJ Paul Foley spinning Duran Duran, Depeche Mode, Van Halen, and all the other ’80s songs that we know appear on your iPod’s ìrecently playedî list. Fittingly, Foley spins all vinyl for this revival night. There’s no cover charge, and admission is for the 21-plus crowd only. (Anyone younger than that might not know his Cult Jam from his Culture Club, anyway.)