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 Greek, Korean and German food. The 42nd Annual Greek Affair at St. Luke’s Greek Orthodox Church (35 North Malin Road, Broomall, 610-353-1592, www.st-luke.org) is running now through September 22. The free festival focuses on...