By Denny Dyroff, Entertainment Editor, The Times When autumn arrives, there are ethnic food festivals almost every weekend. The schedule for the next week has events featuring Mexican, Greek, Indian, German, Chinese, Latin and Polish food. This weekend, Anson B. Nixon Park (North Walnut Road, Kennett Square, www.AnsonBNixonPark.org) will be the site of “La Comunidad Hispana 1st Annual 5K and 1 Mile...