Party for the Planet Celebration Party for the Planet Join the Greenest Zoo in America as we celebrate Earth Day during our 10th annual “Party for the Planet”! Businesses and organizations from around the region will be on hand to share their expertise and resources about living more sustainably within our communities. Topics include solar energy, composting, recycling, energy efficiency, green building, rain gardens/barrels, sustainable food, green products, and much more! 2020 Vendors Interested in being an official Party for the Planet vendor? Click here!