Stop by our booth at Greenfest Philly at Headhouse Square. Greenfest Philly is the largest environmental festival in the Philadelphia area. With over 100 exhibitors and vendors, Greenfest is the place to learn about living sustainably while having fun! This event has something for everyone: shopping for local green wares, great food, live music, live demonstrations, kid-friendly activities, and more. FREE and open to the public.