HAPPENIN’ OTSEGO for SUNDAY, MAY 7 The Music Festival Begins SPRING CONCERT – 4 p.m. The first performance of the Summer Music festival presents Brahms Horn Trio and other classics. The Otesaga, Cooperstown. Info, www.cooperstownmusicfest.org VOLUNTEER – 1-4 p.m. Help clean up the gardens. Tools and refreshments provided. Brookwood Point, 6000 State Highway 80, West Lake Rd., Cooperstown. Info, otsegolandtrust.org…