Halloween, (originally spelled Hallowe’en), is shortened term from All Hallows’ Even – e’en is a shortening of even, which is a shortening of evening. This is ultimately derived from the Old English Eallra Hālgena ǣfen. It is now known as “Eve of” All Saints’ Day, which is November 1st.
The American tradition of “trick-or-treating” probably dates back to the early All Souls’ Day parades in England. During the festivities, poor citizens would beg for food and families would give them pastries called “soul cakes” in return for their promise to pray for the family’s dead relatives. (via history.com)
-From the Daily Contributor team.