Exploring Canadian Halloween - Customs & Traditions of The Great White North Also in this post: · HOW TO CARVE HALLOWEEN PUMPKINS · 50 PRINTABLE PUMPKIN STENCILS · HOW TO PRESERVE CARVED PUMKINS LONGER Origins of Halloween At Halloween in Canada, families from coast to coast come together to celebrate a Celtic festival that began around 400 BC . The festivities most likely commemorate the end of summer and the start of a new year on the Celtic calendar. I