Trivia: What culture celebrated the first Halloween festival, called Samhain?
Correct Answer: Celtics
So why is this answer correct? : Halloween today is a holiday full of candy and costumes, but the celebration has roots in the ancient Celtic festival of Samhain, which began around 2,000 years ago in modern-day Ireland and the U.K. The festival celebrated the new year, which started on November 1, according to the Celtic calendar. The belief was that, on that particular night, there was no boundary between the worlds of the living and the dead.