Yosemite Association Membership Yosemite lovers unite through the Yosemite Association (YA), an organization that supports interpretive, educational, research, scientific and environmental programs in Yosemite National Park. Authorized by Congress, YA operates in cooperation with the National Park Service.YA provides services and direct financial support to promote park stewardship and enrich the visitor experience. Please click on the links to the left to learn more about YA membership. Join Today We invite you to become a member of the Yosemite Association, and help support our work in Yosemite National Park. Take advantage of our Special Membership Offer today. Renew Your Membership Keep your connection to Yosemite current - renew your membership today by clicking here. Yosemite Association Dates For a list of upcoming YA events, programs, and outdoor adventure programs listed by month, click here. Volunteer Opportunities For information about volunteer opportunities for Yosemite Association members, click here. Electronic Newsletters To see an archive of the freee electronic newsletters our members receive, click here. New Members View a list of members who have recently joined the Yosemite Association. Has Your Address Changed? Are you a Y.A. member whose mailing address has recently changed? Please let us know so we can keep sending you all your member mailings. To do so, send us an e-mail detailing the change by clicking here. Thanks!