Volunteer Days. Wachusett Meadow Wildlife Sanctuary 113 Goodnow Rd. Princeton.  9:30 a.m. to 12:30 p.m. Every Tuesday. Learn about nature as you assist with a variety of property, maintenance, and ecological management projects. For all ages. Children under 16 must be accompanied by an adult.  978-464-2712. www.massaudubon.org.