11 a.m.-5 p.m. in DeRivera Park. Annual celebration of the founding of the island village by Jose DeRivera. Sponsored by Perry's Cave Family Fun Center. Food and fun for the entire family, including balloon artist and magician. Ray Fogg will perform a free concert from 12:30 to 2 p.m. The Put-in-Bay Hog Roasters will provide a roast beef picnic lunch.