World UFO Day is celebrated on July 2 every year. It is observed as an awareness day for people to gather together and watch the skies for unidentified flying objects. Few people also observe this day on June 24. On July 2, 1947, a UFO had supposedly crashed in Roswell, New Mexico. The purpose of celebrating this day is to raise awareness of the existence of UFOs and also to encourage governments to declassify their files on UFO sightings.