Some the best NYC events in April celebrate Earth Day. NYC isn’t the greenest city, but New York sure knows how to give Mother Nature a proper party and some much-needed recognition. The best Earth Day events in NYC including volunteering to clean up parks in NYC or beaches to ensure they stay litter-free. There’s also a free Earth Day festival in Union Square and a $1 clothing sale at a well-known thrift store. Get ready to do some tree hugging and check out fun things to do outside.