Saturday night Mars Gallery (1139 W. Fulton Market) is hosting a one-night exhibition of photos by Martin Sorrondeguy, former screamer for Chicago's beloved Los Crudos and the transnational queercore band Limp Wrist, who's now living in the Bay Area. Despite the visual medium, music's still the center of attention in this collection of shots taken during Sorrondeguy's 20-odd years of going to punk shows--singers caught midscream, stage divers frozen in midair, and an entire bestiary of the fashion statements that kids use to tell the world they're into punk rock.