By Denny Dyroff, Entertainment Editor, The Times  Devon Horse Show Memorial Day has arrived and many of the area’s traditional events for the holiday are back – including the Devon Horse Show and Kennett Square’s annual Memorial Day Parade The Devon Horse Show (Lancaster Avenue, Devon, 610-688-2554, www.devonhorseshow.org) is one of the oldest events of any kind in the state. No-one on earth...