Christians have vastly differing opinions on Halloween and how to handle the day. Many Christians in Africa stay indoors to pray all day and night- because they believe demons and demonic activity is rampant that day/night. Others believe that candy and dressing up is acceptable as a way of connecting with others throughout our communities.
Regardless of the opinion or position you hold, we can agree that prayer changes things (ourselves, others, and how we all view God).
If you plan to hand out candy, or even just answer your door while trick-or-treaters are out and about, please offer prayer (especially to adults accompanying children or teens as they go door-to-door).
If someone requests prayer for someone or something, please honor them in praying for their request (it's best to do so in their presence). If someone agrees to have you pray for them, but gives no specifics on how to pray, pray Nehemiah 8:10 "the joy of the Lord is our strength." Most everybody can use some strengthening by Christ's joy- and many experience His joy within moments of that prayer being prayed! Your prayer doesn't need to be eloquent or lengthy, just simply pray, "Lord, I love You, and I ask that you would help ________ experience Your joy this evening. In Jesus' name, Amen."
It's no trick, but it could serve as a loving act that may lead someone closer to Christ. And that should be one of our prayers prior to, and long after people come to our door!
Carry prayer everywhere you go, and be ready to pray anytime someone calls you, or stops by your home. God will do immeasurably more than we ask or imagine (Ephesians 3:20)!
In His grip,