International Children's Day
The World Conference for the Well-being of Children in Geneva, Switzerland proclaimed June 1 to be International Children's Day in 1925. It is not clear as to why June 1 was chosen as the International Children's Day: one theory has it that the Chinese consul-general in San Francisco (USA) gathered a number of Chinese orphans to celebrate the Dragon Boat Festival in 1925, which happened to be on June 1 that year, and also coincided with the conference in Geneva.
The holiday is celebrated on 1 June each year. It is usually marked with speeches on children's rights and wellbeing, children TV programs, parties, various actions involving or dedicated to children, families going out, etc.