Do county fairs make you think of deep-fried Twinkies and Ferris wheels, and maybe some prize-winning pigs? Can you imagine a local food marketplace next to the quilt show, a demonstration farm by the pony rides, fresh fruit for sale in the midway, a community dinner honoring local farmers, and housing available for hundreds of farm-workers the week after the fair closes?

These all thrive at some of California's county and district fairs, and may be part of the future at many others soon. The University of California small farm program and the California Department of Food and Agriculture (CDFA) Division of Fairs and Expositions are teaming up to...