HAPPENIN’ OTSEGO for TUESDAY, SEPT. 12 Tinkering With Window Art TINKERING TUESDAY – 3:30-5 p.m. Draw or design window cling-on to be 3-D printed. Registration required. Huntington Memorial Library, 62 Chestnut St., Oneonta. Call (607)432-1980 or visit www.facebook.com/hmloneonta/ KNITTING GROUP – 1:30-3:30 p.m. Cooperstown Village Library, 22 Main St., Cooperstown, www.villagelibraryofcooperstown.org/calendar…