Tuolumne County, CA Events Event Categories Cook Offs Festivals Film Festivals Quilt Shows Tuolumne County Event OutlookAugust 15, 2025 Film Fest Twain Harte - Twain HarteSeptember 6, 2025 Sierra Apple Festival - SonoraSeptember 13, 2025 49er Festival and Chili Cook-off - Groveland View our full calendar of events