The festival that involves dressing in costumes and walking door-to-door for treats in October is known as Halloween. This event has origins in ancient traditions and has evolved into a popular celebration where children and adults alike partake in the fun. Participants often wear elaborate costumes, ranging from spooky to whimsical, while engaging in the custom of trick-or-treating. Neighborhoods come alive with decorations and festivities, fostering a sense of community as families engage in this festive tradition.