The quaint town of Watsonville is known for its produce, and especially for its strawberries, which are celebrated in this annual festival. Each August, the heart of downtown is packed with locals and visitors partaking of foods (many of them strawberry-based, of course), live entertainment, carnival rides and other old-fashioned diversions.
If you go:
Free admission, but you'll probably have to pay a modest parking fee.
Links:

350 Main Street
Watsonville, California 95076 USA
Phone Numbers:
Watsonville Special Events
+1 (831) 768-3267
+1 (831) 768-3267
Pajaro Valley Chamber Of Commerce
+1 (831) 724-3900
+1 (831) 724-3900