Yosemite National Park will celebrate National Park Week and Earth Day beginning on Saturday, April 20, through Sunday, April 28, 2013. Special events and activities are being sponsored and organized by the National Park Service (NPS), DNC Parks & Resorts at Yosemite, Inc. (the park’s primary concessioner), Yosemite Conservancy, and the Ansel Adams Gallery. https://www.nps.gov/yose/learn/news/earthday2013.htm