The 39-day thoroughbred horse racing season at Del Mar kicks off Friday, July 15 and runs through Labor Day, Sept. 5, promising big hats, colorful silks, musical stars, and the return of the popular racehorse “Chrome.” Among the highlights is the expected return of California Chrome. The 2014 Kentucky Derby and Preakness Stakes winner last appeared at the seaside oval almost two years ago, when he won the Grade I, $300,000 Hollywood Derby in his first try on the turf. In 2015, the chestnut horse spent much of his time overseas and took time off to recuperate from injuries, but he seems to be back to his winning ways this year.