Facelift

Yosemite Facelift is the largest annual volunteer clean-up event in any national park. Hosted by the Yosemite Climbing Association (YCA) in partnership with the National Park Service, this five-day event invites people from all walks of life—climbers, park lovers, families, locals, and visitors—to help care for Yosemite after its busiest season.

https://www.yosemiteclimbing.org/facelift