What’s new in arts and entertainment, Aug. 31 Folk Art From the Mexican Museum, Gleeson Library, University of San Francisco (through Dec. 12). Shiny Toy Guns, NO, the Frail, Great American Music Hall, S.F. (Thurs.). Senses Fail, No Bragging Rights, Knuckle Puck, Slim’s, S.F (Fri.). Chaos Tribe, Mutant Itch, Blown to Bits, World Rage Center, Oakland (Sat.). Keith Urban, Jerrod Niemann, Brett Eldredge, Shoreline Amphitheatre, Mountain View (Sat.).