The Hingham Singers, a Boston-area ensemble, will present “The Music of Peter, Paul, and Mary” on Friday, July 19, at First Congregational Church, 28 High Street in Wiscasset, and on Saturday, July 20, at First Congregational Church, 55 Elm Street in Camden. Both performances begin at 7:30 p.m. There is no admission fee, though donations are welcome. The group of 11 singers is accompanied by guitarists Steve Waynen and Paul Cappers