Saturday, August 10, 1 p.m. at the Winthrop Performing Arts Center (211 Rambler Road in Winthrop), a concert by the Quebecois folk group Tidal Wave (Raz de Marée) and friends, featuring French Canadian songs and dance tunes performed on fiddle, accordion, piano, string bass and voice, plus folk dance demonstrations. Admission: $8, $5 for students up to age 22. For more information call: 782-0386.