1 to 3 p.m. in Jefferson
Hidden Valley Nature Center is featuring a nature walk by master naturalist Jason Chandler: Explore the landscape with an eye to the past. What does a large basal scar on a 100-year-old oak tree say? What fire evidence might we uncover? Hidden Valley Nature Center is on 1,000 acres of diverse habitat. For more information, go to www.hvnc.org or call 586-6752.
Eastern Trail Walk
6 p.m. in Kennebunk
Naturalist Joe Yuhas and Eastern Trail former president John Andrews will lead a leisurely walk on the Eastern Trail leaving from the Kennebunk Elementary School parking lot on Route 35. Children are welcome with adult supervision. No pets. Flashlights are encouraged. For more information, call 283-4487 or 282-1979.