Suppose The origins of Halloween can be traced back to the ancient Celtic festival of Samhain, a festival that marked the end of the harvest season and the beginning of winter. People believed that on the night of October 31st, the boundary between the living and the dead was blurred, allowing spirits to roam the earth. To ward off these spirits, people would light bonfires and wear costumes.
Can we infer that "Halloween celebrations started in the 20th century"?