The largest of its kind in Northern California Mar. 1: 8 a.m.–8 p.m. Mar. 2: 8–9 a.m. (Sensory), 9 a.m.–3 p.m. (4:30–8 p.m.: half-price presale). Mar. 3. 8 a.m.–1 p.m. (half-price sale). Admission: $4–$15. Platinum passes $75–$125. Sonoma County Fairgrounds. 1350 Bennett Valley Rd., Santa Rosa. Tickets: tinyurl.com/55k4b3bd.