From 8 p.m. to midnight, Friday, May 13, Electric Mayhem, one of Lewiston-Auburn’s newest party-dance bands, performs at Pedro O’Hara’s,  134 Main St., Lewiston. Electric Mayhem plays  a collection of today’s hits and some of the best from the ’80s and ’90s. On Saturday, May 14, from 8 to 11 p.m., Big G & Rhino brings the best in old school and contemporary blues, with Gary “Rhino” Searles on harp and vocals, Glen “Big G” Rogers on bass, vocals and guitar and with special guests Sam “Boom Boom” Bobinger on drums and Chris “Guitar” Floyd on lead guitar. There is no cover charge either night.