When my children were growing up, we spent a week every summer camping in Yosemite National Park. To get a campsite on the river, their dad would book the reservation as early as possible, a year and a day in advance. The summer after he died, the kids and I camped on the reservation he had made for us.
http://www.reporternews.com/news/2009/jul/26/at-yosemite-a-family-reconnects-with-past/