Yosemite National Park will celebrate National Park Week and Earth Day from Saturday, April 19, through Sunday, April 27, 2014. Special events and activities are being sponsored and organized by the National Park Service (NPS), DNC Parks & Resorts at Yosemite, Inc., Yosemite Conservancy, and the Ansel Adams Gallery. https://www.nps.gov/yose/learn/news/yosemite-national-park-celebrates-national-park-week-and-earth-day-with-special-programs-and-activities.htm