This Purple Scary Halloween Party Invitation is for a holiday celebrated in the United States and Canada on October 31, the last day of the month. Halloween derives from the Celtic pagan holiday known as Samhain, which marked the beginning of winter. This is the time of year when pagans believed the veil between the living and the spirit world was thinnest, allowing the dead to visit the earth and druids (Celtic priests) to foresee the future. After Christianity gained a foothold in Europe, Pope Gregory III expanded All Martyr's Day to include saints and made it last until November 1.
