Wallpaper for Halloween depicting the 'Witches' Night'. Halloween which is celebrated on the night of October 31, originates from the Celts in Ireland. According to the legends, the witches are gathering twice a year when the seasons changed, on April 30 and on the eve of October 31, arriving on broomsticks, to celebrate a party hosted by the devil. Superstition says that they fly in the sky and spread a magic in every nook and corner.