When did we start celebrating spooky season? Halloween, celebrated every 31st October, has roots stretching back over 2,000 years to the ancient Celtic festival of Samhain (pronounced "sow-in”), marking the end of harvest and the beginning of winter. The Celts, who lived in what is now Ireland, the UK, and northern France, believed that on the night before the new year, 1st November, the boundary between the living and the dead blurred. Ghosts could return to earth, so people