Frog Jumping Jubilee Day is celebrated annually on May 19 in Angels Camp, California, during the Calaveras County Fair. This event features the International Frog Jumping Contest, where frogs compete in jumping competitions, attracting between 30,000 to 50,000 attendees. The tradition began in the 1920s, inspired by Mark Twain's short story "The Celebrated Jumping Frog of Calaveras County," which was published in 1867. The event merges local history and folklore, showcasing a mix of community spirit and entertainment. The fair is characterized by its small-town atmosphere, despite its large turnout, and includes various festivities beyond the frog jumping contests.