The holiday is a blend of ancient Celtic and medieval Christian traditions:

All Hallows' Eve, celebrated annually on , is the evening vigil preceding All Saints' Day (November 1st). The name is derived from the Old English word "hallow," meaning "holy" or "sanctified," making it literally the "holy evening". Historical Origins

: Many modern traditions stem from the ancient Celtic festival of Samhain (pronounced "sow-in"), which marked the end of the harvest and the start of the "dark half" of the year. It was believed that the boundary between the living and the dead blurred during this time, allowing spirits to walk the earth.