The history of Halloween: The history of Halloween goes back to the Celtic festival of Samhain, which marks the end of a bountiful harvest for the summer and the beginning of the cold winter. The Celts, who lived many years ago in the areas now called Ireland, the United Kingdom and northern France, believed that the dead returned to earth on Samhain. So, to pay homage to the dead, people gathered to light bonfires, offer sacrifices, and dress up in costumes made from animal skins. It also helped to ward off unwanted visitors. Moreover, food was left on tables outside to satiate these spirits.