Observer Editor, Free
Volunteer Day: Hudson Mills Metropark.
Ages 12 & up invited to help remove invasive garlic mustard. Wear long pants and closed-toe shoes; tools, snacks, & know-how provided. Minors must be accompanied by an adult or obtain a release form in advance. 10 a.m.–1 p.m., Hudson Mills Metropark Group Camp, 8801 North Territorial Rd., Dexter. Free. Preregistration required. $10 vehicle entrance fee. 426–8211.