1 Ancient Origins of Halloween. Halloween’s origins date back to the ancient Celtic festival of Samhain (pronounced sow-in). ... 2 All Saints' Day. ... 3 Halloween Comes to America. ... 4 History of Trick-or-Treating. ... 5 Halloween Parties. ... 6 Halloween Movies. ... 7 All Souls Day and Soul Cakes. ... 8 Black Cats and Ghosts. ...