Green Festival is the largest and longest-running sustainability and green living event in the United States. Now in its 10th year in the nation’s capital, Green Festival D.C. is attended by more than 20,000 Washington-area attendees. At Green Festival, Washington’s green community will have an opportunity to learn from innovative national and local green businesses, and pioneering thinkers about how to live healthier, more sustainable lives – and experience the latest in sustainability and green living.