Final answer:
Halloween is celebrated on October 31st and has origins in the ancient Celtic festival of Samhain as well as Christian traditions. It has evolved into a community event involving costumes, treats, and various festivities.
Step-by-step explanation:
Halloween, observed on October 31st, is widely recognized as a holiday that includes activities like trick-or-treating, costume parties, and carving pumpkins. It has roots in ancient festivals and religious rituals. One of the most significant is the Celtic festival of Samhain, celebrated to mark the end of harvest and beginning of winter. The Celts believed that on this night, the boundary between the living and the dead became blurred and the ghosts of the dead returned to earth. Halloween also has connections to Christian traditions, where it precedes All Saints' Day. Over time, Halloween has evolved into a community-based, child-friendly celebration characterized by fun and treats.