Final answer:
The Catholic Church influenced the celebration of Halloween, which was originally a Catholic holiday known as All Hallows' Eve. Some Catholics dressed up in costumes on this night to protect themselves from evil spirits and deceased souls.
Step-by-step explanation:
The subject of this question is history, specifically the influence of the Catholic Church.
Halloween was originally a Catholic holiday called All Hallows' Eve. The Catholic Church moved the holiday to November 1st, which is All Saints' Day. In Old English, the evening before All Saints' Day was called All Hallows' Eve, which eventually became Halloween.
Some Catholics dressed up in costumes on Halloween to protect themselves from evil spirits and deceased souls, as it was believed that the spirits could come back and cause harm. The costumes were a way to ward off these spirits and ensure protection.
Learn more about The Influence of the Catholic Church