The Posters: Guerrilla Girls on Tour: Guerrilla Girls formed in the 1980s as a crew of anonymous women artists in gorilla suits who fight for equity for women in the art world. “Do women have to be naked to get into the Met. Museum?” asks one of their most famous posters. Wonder what they would ask about the occasion for this exhibition, which opens on International Women’s Day (“Do women have to have a day to…”). This chance to consider what they've been able to accomplish, and what they haven't, is a treat.