The Clearwater Festival (officially The Great Hudson River Revival) is a music and environmental summer festival and America’s oldest and largest annual festival of its kind. This unique event has hosted over 15,000 people on a weekend in June for more than three decades. All proceeds benefit Hudson River Sloop Clearwater, Inc., a 501(c)(3) nonprofit environmental organization.

The Festival, a celebration for the Hudson River, features singer-songwriters, performers and musicians offering fun with a purpose — a diverse mix of contemporary, traditional and American Roots music, dance, family-oriented entertainment and storytelling. In addition to music and dance, a juried craft show, Green Living Expo, working riverfront, environmental education sites, and a Circle of Song featuring audience participation fill out the weekend’s schedule.

https://en.wikipedia.org/wiki/Clearwater_Festival
http://www.clearwaterfestival.org/