This free event for all ages will be held inside the Chesterfield Mall lower level, with informational exhibits, free tree and native pollinator giveaways, eco-friendly products and entertainment. It is organized by Chesterfield Citizens for the Environment Committee. The first Earth Day was observed in 1970. On April 22, 1990, 200-plus million people in 141 countries celebrated Earth Day. 10 a.m. to 3 p.m.