“The Mistake” a play about Hiroshima written and acted by British playwright Michael Mears with Japanese Actor Riko Nakazono will be performed on Sat., April 19 at 2:00 p.m. free at Old Chatham Quaker Meetinghouse, 539 County Route 13, Old Chatham, NY www.oldchathamquakers.org 518-610-3735.