GET FILTHY As queer culture goes mainstream, its “edgy underground nature” dissipates, says Maxi Glamour, a fashion designer and event planner for Qu’Art (a.k.a. Queer Art). To keep the rebel vibe alive, Glamour and DJ Monsieur Gaston have announced the first annual Filthy Filth Fest for the night after Thanksgiving. It aspires to be a…