HAPPENIN’ OTSEGO for TUESDAY, DECEMBER 12 Make a Christmas Tree Table Topper with the Harris Memorial Library WINTER CRAFT—10 a.m. “Decorative Christmas Tree Table Topper.” Harris Memorial Library, 334 Main Street, Otego. (607) 988-6661 or visit https://www.facebook.com/harrislibrary/ BLOOD DRIVE—3-7 p.m. YMCA at the Southside Mall, 5006 State Highway 23, Oneonta. RedCrossBlood.org…