LUBEC – The SummerKeys’ Mary Potterton Memorial Concert will be held at the Lubec Congregational Christian Church, 7:30 p.m. Wednesdays June 27 through Aug. 29. Audience members may enter no earlier than 7:15 p.m. because of the George Bozeman organ concert, which will begin at 6 p.m., or come and enjoy two concerts. No charge, though donations to the piano tuning fund are appreciated.