Some years ago, I worked the evening shift. I enjoyed listening to the radio as I commuted, because at that time I could hear a folk music show on my way home. One night, every song played had the devil as its subject. When I noticed this, I first wondered why, then I remembered it was halloween. That was the night when God brought home to me that halloween was the devil's holiday.
Eph 5:11 And do not participate in the unfruitful deeds of darkness, but rather even expose them.