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Muscle Mobb Car Club presents Horsepower Hour 4 on July 11, 2026, at the Contra Costa County Fairgrounds in Antioch, California. The event runs from 11:00 a.m. to 5:00 p.m.
All classic and muscle cars are welcome. Activities include a car show, show and shine, best of show competition, live DJs, vendors, food, music, and raffles. The event is family friendly.
Entry fees are as follows: VIP, $75; car entry, $40; motorcycles, $30; spectators, $20; children under 10, free. Tickets are available for purchase online.
