It’s summer in Southern California, and for horseplayers that can only mean one thing: Del Mar is here! The annual Del Mar summer Thoroughbred meet opens on Friday, July 21 and will usher in California’s most looked-forward-to season of horse racing. The 2023 Del Mar summer meet will be conducted mostly on a four-days-a-week basis, Thursdays through Sundays plus Labor Day for eight weeks ending on Sunday, Sept. 10.