Also: Fountains, Fireworks and…ABBA at Longwood By Denny Dyroff, Staff Writer, The Times Musicians are invited to bring their instruments and voices to the Third Annual Lanchester Fiddlers Picnic in Atglen from 10 a.m. until 5 p.m., Saturday. The Chester County Old Fiddlers Picnic, which was held recently at Hibernia Park, has been a major success for years. Now, there is an event that would like...