The holiday known for the tradition of trick-or-treating is Halloween, celebrated on October 31st each year. This festive occasion has origins in ancient Celtic festivals, particularly Samhain, marking the end of the harvest season and the beginning of winter. During Halloween, children dress in costumes and go door-to-door in their neighborhoods, asking for treats while uttering the phrase "trick or treat"! The tradition reflects the playful spirit of Halloween, incorporating elements of fun, spookiness, and community interaction, while evoking the spirit of the season.