Halloween started a few thousand years ago. It starrted in Ireland with the ancient Celts. October 31st was suppose to be the end of there there agricutural year. They had a large festival to celebrate the "new year". During the festival the Celts believed that their ancestors could come back visit with the living relatives. The Celt would leave food for their relatives, and offer them a place to stay. They did this because they feared the ancestors and thought that if they didnt it would make them unhappy, and that they would hurt you. "During the celebration, the Celts wore costumes, typically consisting of animal heads and skins, and attempted to tell each other's fortunes. When the celebration was over, they re-lit their hearth fires, which they had extinguished earlier that evening, from the sacred bonfire to help protect them during the coming winter." (http://www.history.com/minisites/halloween/viewPage?pageId=713) Later as Christanity spread November 1st became all Saints Day, and the eve (Oct. 31) was "Allhallowmas". Which is what we now call Halloween.