Sept. 20 (1:30–3 p.m.).  A township naturalist leads a walk in the fall woods for kids ages 5–12 to look for migrating birds and signs of mammals and insects preparing for winter. Dress for the weather and bring water. Pavilion 3, Lillie Park South, 4365 Platt Rd.  $15 (Pittsfield residents, $10). Preregistration required at recreation.pittsfield-mi.gov or 822–2120.