This is The Californian.

Santa Anita Park welcomes The Californian, a one day celebration that combines the prestige of a classic motorcycle show with the excitement of a day at the horse races. The event is built around an exhibit of vintage & custom motorcycles with family friendly activities ranging from a pine wood derby, a food truck rally, a pop-up retail experience, & art show. The background, of course, is the spectacular scenery and mountainside view of Santa Anita Park and its unprecedented horse racing history. Sponsors will create unique spaces to showcase their products & judges will sort through the entries to name the best of each class while a variety of musical artists take the stage throughout the day.