Fourteen bands on 3 stages. Vendor & food booths. $60–$169. Ages 12 & younger: free with a paying adult. Bring blanket or low-back chair. No pets. Benefits music programs in Petaluma schools. 11:30 a.m.–9:30 p.m. Sonoma–Marin Fairgrounds. 175 Fairgrounds Dr., Petaluma. tinyurl.com/5626v6na.