HAPPENIN’ OTSEGO for TUESDAY, AUGUST 22 Music Of Bach With The Cooperstown Summer Music Festival MUSIC FEST—7 p.m. All-Bach. Part of the Cooperstown Summer Music Festival 25th anniversary season. $30, adults; $15, students under 18. Purchase tickets in advance at www.cooperstownmusicfest.org. Christ Episcopal Church, 46 River Street, Cooperstown. BLOOD DRIVE—9 a.m. to 2 p.m. Elm Park Methodist Church, 401 Chestnut Street, Oneonta. Register at RedCrossBlood.org…