National Missing Children's Day is always celebrated in US...

History of National Missing Children's Day
National Missing Children’s Day was proclaimed by President Ronald Reagan in 1983 to acknowledge the many children who go missing each and every year. From 1979 to 1981, a series of child abductions shook America.

And it began with the disappearance of 6-year-old Etan Patz in New York City, on May 25, 1979, while he was on his way to school from the bus. Etan was unfortunately never found but the accused, Pedro Hernandez, received a prison sentence in 2017.

On May 25, 1979, Etan Patz was only six years old when he disappeared from his New York City home on his way from bus to school. The date of his disappearance was designated as National Missing Children's Day.

https://www.globaltechedu.com/2022/05/national-missing-childrens-day-review.html