October 31st is a date of deep antiquity. In the Christian calendar, it is the day before All Souls Day, or Hallows Day, the eve of which is known as Halloween - a time for trick or treat, or benevolent mischief long celebrated by children. But the history of this eve is mystic and malevolent. In the Celtic calendar, those brooding, dark people celebrated it as the last day of the year. A day given over to witches and warlocks and their sinful and wicked revels.