Nov. 30 (2–3:30 p.m.). Kids ages 5–12 and their families invited on a walk to learn about nuts as a valuable food source for humans and other animals. Pittsfield Preserve West Entrance, Thomas Rd. at Marton Rd., Ann Arbor. $15 (Pittsfield residents, $10). recreation.pittsfield-mi.gov, 822–2120.