Observer Editor, Free
“Hike around Mill Lake”: Waterloo Natural History Association.:
All invited to join a relatively flat 3-mile hike around a kettle lake, passing historic cabins, and through oak hickory forest. Wear sturdy shoes and bring water. 9–11 a.m., Eddy Discovery Center, 17030 Bush Rd., Chelsea. Free. 475–3170. $11 state recreation passport required ($16 at the gate). wnha.org/events., . . . . . .