So many weird "National" and "World" Days, so little time.
- Commemorates the estimated date the world population reached 5 billion in 1987.
- Established by Governing Council of the United Nations Development Programme in 1989.
- A day to raise awareness of overpopulation and related issues.
National Cheer Up The Lonely Day.
- Created by and birthday of Francis Pesek of Detroit, Michigan.