Disneyland Day celebrates the birthday of Disneyland California and its impact on the world of entertainment. Walt Disney opened Disneyland California on July 17, 1955 facing a wall of doubt. People believed that this was the end of his career, and indeed the opening day was not quite a success, with the park unprepared for the large number of attendees. But fortunately the troubles of opening day did not foreshadow trouble to come as Disneyland began operating smoothly a few weeks later and took only a few months to become the most visited place in the USA, so it’s opening day is worth celebrating despite its problems. This holiday was first proclaimed in 2015, Disneyland’s 60th year.