Annually on the 28th of December
The Feast of the Holy Innocents, also called Childermas or Innocents’ Day, is a Christian feast in remembrance of the massacre of young children in Bethlehem by King Herod the Great in his attempt to kill the infant Jesus (Matthew 2:16–18). The day is still observed as a religious feast day and, in Roman Catholic countries, as a day of merrymaking for children.