Chase's Calendar of Events is a comprehensive reference guide that provides information on notable events, observances, anniversaries, and holidays occurring each day of the year. It has been published annually since 1957. The 2016 edition highlights events such as the Olympics in Brazil, the 25th anniversary of the USSR collapse, and the 100th anniversary of the U.S. National Park Service. It contains over 12,500 entries across 196 countries and 752 pages of content including astronomy, religious observances, presidential proclamations, and birthdays. The calendar can be found in most library reference sections.