When I was a kid, Shields and Yarnell ruled the school. I’d do that “trapped in a box and can’t get out” routine on a disturbingly regular basis. But make no mistake, the 52-year-old San Francisco Mime Troupe won’t be doing any of that silly stuff when they bring 2012: The Musical to Mill Valley. “We are satirists seeking to make you laugh at the absurdities of contemporary life,” they declare; see them on Wednesday, Aug. 31, at the Mill Valley Community Center. 180 Camino Alto, Mill Valley. 6:30pm. Free. 415.285.1717.