All Hallows' Eve - The term Halloween is shortened from All Hallows' Eve, as in the evening of All Hallows' Day, which is also known as All Saints' Day in Europe. Halloween has its origins in the ancient Celtic festival known as Samhain. The festival of Samhain is a celebration of the end of the harvest season in Gaelic culture, and is sometimes regarded as the "Celtic New Year". The ancient Gaels believed that on October 31, now known as Halloween, the boundary between the alive and the deceased dissolved, and the dead become dangerous for the living by causing problems such as sickness or damaged crops. Irish immigrants carried versions of the tradition to North America in the nineteenth century.
Halloween is celebrated in several countries of the Western world, most commonly in the United States, Canada, Ireland, Puerto Rico, Japan, New Zealand, United Kingdom and occasionally in parts of Australia. In Sweden the All Saints' Day official holiday takes place on the first Saturday of November. 