The Kennett Square Mushroom Festival will be in full bloom Sept. 9-11 with old favorites and surprising new additions By P.J. D’Annunzio, Staff Writer, UnionvilleTimes.com Crowds throng the streets of downtown Kennett Square during the 2010 Mushroom Festival. Photo courtesy Mushroom Festival. KENNETT SQUARE—The Mushroom Festival is just one of those things that grows on you: it’s an event...