Tonight, for one night only, Yerba Buena Center for the Arts will be featuring two sneak previews of Dirty Country, a highly entertaining documentary about the underground world of raunchy music, directed by Joe Pickett and Nick Prueher, founders and hosts of the Found Footage Festival, which sold out four shows at the Red Vic last month. Dirty Country, which won the Audience Award at this year's South By Southwest, is part of Yerba......