HAPPENIN’ OTSEGO for SUNDAY, SEPTEMBER 17 Fall Festivals HARVEST FESTIVAL—10 a.m. to 5 p.m. Celebrate the bounty of fall with a variety of performers, artisans and vendors. Included with admission. The Farmers’ Museum, 5775 State Highway 80, Cooperstown. (607) 547-1450 or visit https://www.farmersmuseum.org/ HARVEST FESTIVAL—10 a.m. to 4 p.m. Bucolic festival featuring music, demonstrations, food, tastings, artisans, vendors, activities, much more. Main Street, Sharon Springs. Visit https://www.sharonspringsharvestfestival.com/ FESTIVAL—Noon to 5 p.m. City of the Hills Festival. Two days of arts, music, food and…