Everyone is invited to celebrate Earth Day with the Bartlett Nature Center and the Bartlett Parks Foundation at their family-friendly, environmental awareness event. See a variety of demonstrations, educational exhibits, and participate in hands-on activities. The natural world around us is always changing, but one thing that hasn’t changed is this free annual event. No reservation required. Open to all ages and held from noon to 4 p.m. on Saturday, 4/21 at Bartlett Nature Center, 2054 W. Stearns Road, James “Pate” Philip State Park.