Do: Sign up with the Chicago Parks District for an Earth Day park cleanup on April 23, at parks like Douglass Park, McKinley Park, and Ogden Park. Do: Head to Humboldt Park April 23 for an Earth Day celebration, featuring play areas, food, and drinks. Drink: Enjoy an eco-friendly candlelight happy hour at Reviver on April 22 from 3-7 p.m., with a portion of sales going to FamilyFarmed.