Littleton Cemetery Walk: 2:30 p.m. Sept. 24, Littleton Common. Founding Families will be the theme for the Littleton Historical Society’s walk at the Old Burying Ground. Participants will learn about early town history and “meet” those who helped organize and shape the town after its establishment in 1714. Rain date is Oct. 8. Meet at the Old Burying Ground at 2:30 p.m. at the corner of King and White streets at Littleton Common. Free; no registration required. For information: 978-486-8202.