Del Mar Fairgrounds to host smaller event in place of annual county fair Del Mar Fairgrounds and last updated 2021-04-14 16:59:53-04 SAN DIEGO (KGTV) â In place of the annual San Diego County Fair this summer, the Del Mar Fairgrounds announced Wednesday that it will hold a smaller, scaled-down four-week celebration. The HOME*GROWN*FUN event will be held from Friday, June 11 through Sunday, July 4 by the 22nd District Agricultural Association, which traditionally hosts the annual county fair. Much like the traditional fair, the event will feature tasty fair dishes, shopping, a Ferris wheel and carousel, agricultural exhibits, entertainment, and more.