To be completely honest I don't really care for Halloween. What was once a day for kids to dress up and get candy has become one more excuse for "grown-ups" to act childish. Furthermore I don't care for the day's emphasis on fear, gore, and sexuality (Have you seen some of the costumes for women hanging in stores??!!). I'd rather celebrate today as Reformation Day-- which is far more historically and spiritually meaningful. However, for better or worse we're stuck with Halloween as a growing phenomenon on October 31 so don't waste the opportunities it presents.
Tonight will be one of the few times in our impersonal culture when you can knock on a neighbor's door or strangers can knock on yours and the expected reception is friendliness. It will be like the 50's and 60's again when neighbors actually interacted with each other and opened their front porches to each other. So as a Christian, don't waste this. Keep your porch light on. Be hospitable. Give out candy (and gospel tracts or invitations to your church's worship). Remember that unbelievers will actually be coming to your door-- or you can go to their's! You don't have to endorse everything about this day to demonstrate Christ-likeness. Redeem the night by practicing gospel living on your front porch.