HAPPENIN’ OTSEGO for FRIDAY, NOV. 25 1840s Thanksgiving At Farmers’ Museum To Learn How You Can Help Area Families This Holiday Season CLICK HERE. THANKSGIVING AT THE FARM – 10 a.m.-4 p.m. Learn about Thanksgiving Traditions of the 1840s. The Farmers’ Museum, 5775 NY-80, Cooperstown. Info, farmersmuseum.org/Thanksgiving-at-the-Farm THANKSGIVING BOOK SALE – 10 a.m.-5 p.m. 30% for books in 6 local bookshops. Hobart Book Village, Main St., St. Rte. 10, Hobart. Info, www.hobartbookvillage.com BOOK SIGNING – 1-4 p.m. Local mystery/thriller author Adam Cornell…