Arbor Day (from the Latin arbor, meaning tree) is a holiday in which individuals and groups are encouraged to plant and care for trees. It originated in Nebraska City, Nebraska, United States during 1872 by J. Sterling Morton. The first Arbor Day was held on April 10, 1872, and an estimated 1 million trees were planted that day.

Many countries now observe a similar holiday. Though usually observed in the spring, the date varies, depending on climate and suitable planting season.

Children's Day is celebrated on various days in many places around the world, in particular to honor children. Major global variants include a Universal Children's Day on November 20, by United Nations recommendation.^[1] Children's Day is often celebrated on other days as well.

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 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.^[2][3] Official discourse in Turkey argues that Children's Day had its origin in Turkey. The Grand National Assembly of Turkey was established on 1920, April 23, and to commemorate the event, April 23 was proclaimed a national holiday in 1921. The founder of The Republic of Turkey,Atatürk, has given this day to the children.