1990s rockers 311 and the Offspring come out and play at State Fair Aug. 31

Time to break out the Doc Martens and hair beads again. The two staples of '90s rock radio — see: "Amber" and "Down" for Omaha's reggae-fied groovers 311, and "Come Out and Play (Keep 'Em Separated)" and "Self Esteem" for L.A. pseudo-punks the Offspring — are doing a summer tour together, and they're bringing '00s one-hitters Gym Class Heroes as the opening band. (7:30 p.m. Aug. 31, grandstand, $49 and $59, etix.com.)