The correct answer is: World UFO Day.
World UFO Day is celebrated on July 2 every year. It is a day to raise awareness of the possibility of extraterrestrial life and to encourage people to share their UFO sightings. The day was first celebrated in 2001 by UFO researcher and author Stanton Friedman.
World Coffee Day is celebrated on October 1 every year. It is a day to celebrate the coffee industry and to raise awareness of the importance of coffee in the world economy. The day was first celebrated in 2015 by the International Coffee Organization.
World Car Free Day is celebrated on September 22 every year. It is a day to encourage people to give up their cars and use alternative forms of transportation, such as walking, biking, or public transportation. The day was first celebrated in 1998 in France.
World Post Day is celebrated on October 9 every year. It is a day to celebrate the Universal Postal Union, which is an international organization that promotes cooperation between postal services around the world. The day was first celebrated in 1969.