10. Symbiosis Gathering (Northern California, September 17-21, www.symbiosisgathering.com). The Symbiosis Gathering’s goal is to “create an experience that is transformative and inspiring, based in a deep respect for our community and environment.” It’s not only a music festival but an art and wellness festival as well. Working with EcoGatherings, a green event organizer, Symbiosis has been able to stay environmentally friendly by reducing waste and integrating environmental education into all their events. They have a “leave no trace” visitor policy and recycling and public transportation systems set up. Even their promotions use non-toxic ink and tree-free or recycled paper.