Also, the Mavericks are back, Jackie Evancho to record TV special at Longwood By Denny Dyroff, Staff Writer, The Times Next week, Stu Frederick, a musician from Glenmoore, will play a gig about as close to his home as physically possible. On August 12 at 7 p.m., the Eagleview Summer Concerts on the Square (Wellington Square, Exton, www.ineagleview.com) will host the Rivers Rockabilly Trio and...