The county fair includes livestock, entertainment, carnival rides and games, entertainment, home arts, photography and fine arts exhibits and more. $5; seniors 65 and older $3; children 6-12, $2. Parking $3 (4 or more park free). Friday-Sundays 10 a.m.-midnight; Mondays-Thursdays noon-midnight. Orange County Fairgrounds, 88 Fair Drive, Costa Mesa. (714) 751-3247.
Old Adobe Day
* The city of San Buenaventura re-creates a rancho fiesta with music, dancing and foods popular in old California. Rancho crafts and demonstrations. 11 a.m.-3 p.m. Olivas Adobe, 4200 Olivas Park Drive, Ventura. $3; children under 12, $1; 4 and under free. (805) 644-4346.