The festival of rock'n'roll, blues, New Orleans R&B, swamp pop, rockabilly and more features Freddy "Boom Boom" Cannon, Irma Thomas, Brenda Holloway, Mable John, Barbara Lynn, Roy Head, Willie Hightower, P.F. Sloan, Billy Boy Arnold and others. The weekend also includes a music history conference and a record show. Single-night ticket $60; two-day passes $100 until May 1 or $110 thereafter. Visit www.ponderosastomp.com for details.