Halloween is a holiday celebrated on October 31st, and Halloween 2021 will occur on Sunday, October 31st. The tradition originated with the ancient Celtic festival of Samhain when people would light bonfires and wear costumes to ward off ghosts. You can create a Halloween Calendar with Halloween-based theme icons, images, and Halloween events. As graphically illustrated in the below Halloween Calendar, on the night of October 31st every year, several community members celebrate Samhain, when it was believed that the ghosts of the dead returned to earth. In Samhain, people would light bonfires and wear avant-garde costumes to keep the ghosts at bay.