Nor-Cal Bus Fest 11. Sunday August 9, 2015. Contra Costa County Fairgrounds (use main entrance), 1201 West 10th Street, Antioch, CA 94508. Gates open at 8:00 for this display and swap event open to ALL Volkswagen buses and trucks, regardless of year, model or condition. General admission is still just $10 per adult, and includes entry, display and or/swap space.