All Saints’ Day，which falls on 1st November，is regarded in the West as a festival．It was formerly a religious day and has been observed since the ４th century．３１st October，the night before All Saints’ Day called Halloween，was originally New Year’ s Eve celebrated by the Celts．The Celtic authoritative2） druids3） believed that demons and spirits of the dead roam the earth on their New Year’ s Day．In order to protect themselves from any potential tricks and harms done to them，they wore frightful masks and disguised themselves so that the spirits would think the druids belonged to their own evil company．
