What do blues, rock, and Americana sound like when cello replaces electric guitar? Find out when San Francisco’s Dirty Cello performs at Rockin’ the River on September 14, 6–7 p.m. The free concert on the plaza in downtown Guerneville will also feature the Bourbon Street Brass Band’s New Orleans beats, 7–7:30 p.m., and the Sacred Fire Band’s Santana covers, 7:30–9 p.m. Find out more at rockintheriver.net.