Also, Valley Day, Swingin’ Summer, Symphony at Longwood and more By Denny Dyroff, Staff Writer, The Times The Chester County Old Fiddlers’ Picnic on Aug. 9 is celebrating its 86th anniversary. When it comes to longevity, there are few annual events in the area that come even close to the Chester County Old Fiddlers’ Picnic (Hibernia County Park, off Route 340, Wagontown, 610-383-2812, http://dsf.chesco.org/ccparks). The...