The major holiday celebrated on October 31st is Halloween. This festive occasion is marked by various traditions, including trick-or-treating, costume parties, and haunted houses. Originating from the ancient Gaelic festival of Samhain, Halloween represents the time when the boundary between the living and the dead is believed to be thinnest. People often dress up in costumes ranging from spooky to whimsical, celebrating the playful spirit of the holiday. Halloween has grown into a significant cultural event, heavily commercialized, particularly in Western countries, with decorations and themed events.