International Children's Day is held on June 1 every year. To mourn the Lidice massacre on June 10, 1942 and all the children who died in wars around the world, to oppose the killing and poisoning of children, and to protect children's rights. It is a festival set up to protect children's rights to survival, health care, education, and custody in all countries of the world, to improve children's lives, and to oppose child abuse and poisoning. Many countries in the world have designated June 1 as a children's holiday.