If they are trying to use certain secular holidays for evangelistic purposes, to win souls, this is the way I would do it as a minister: I would make it a biblical movie night with popcorn and soft drinks for the kids and grownups, and invite unsaved friends and family. My intention for the event would be to expose the origin and dangers of Halloween, then turn it into a great movie night, with a small teaching afterward from God’s Word about His love and the finished work of the cross. Finally, I would have an altar call and make it a special night for all to remember.
Source: Former Satan Worshipper: I’m Shocked Christians Celebrate Halloween — Charisma News