All invited to help remove invasive species such as buckthorn, honeysuckle, and autumn olive. Wear appropriate clothing and closed-toe shoes. Also, bring water, sunscreen, and bug spray. Tools and work gloves provided. 10 a.m.–noon., Johnson Preserve, 4595 Platt. Preregistration required at bit.ly/johnsonpreserveworkday. Free. 302–5263.