By Denny Dyroff, Entertainment Editor, The Times The Chester County Restaurant Festival The Chester County Restaurant Festival (Gay Street and downtown area, West Chester, 610-436-9010, http://www.downtownwestchester.com/view_program.php?id=293) is celebrating 40 years of treating visitors to the borough with the opportunity to sample a wide variety of gourmet treats for almost 40 years. This year,...