By Denny Dyroff, Entertainment Editor, The Times Shakti On August 22, the Keswick Theater (291 N. Keswick Avenue, Glenside, 215-572-7650, www.keswicktheatre.com) will present a special concert – a concert featuring a rarely touring international supergroup – a concert where East meets West and North meets South. That band is Shakti. It is led by English guitarist John McLaughlin and Indian percussionist...