I love Halloween. It's a day of great inspiration for horror writers such as myself, and it's fun to harmlessly indulge in the vices of gluttony, lust, and darkness once a year. I think I'll sit back, eat and pass out candy, lust after the women in revealing costumes, and write some stories. Maybe I'll grill up some ribs for dinner or pressure my grandmother into making that fancy Mexican stew she always makes on Halloween.
Have I ever done anything to "witness" to children on this day? Heck no. What is this, Evangelicalism? They don't want religion they want candy. Using this holiday to "witness" to unsupervised, minor children without their parents seems to be immoral IMHO--how would we feel if Muslims did the same to our kids?
If you want to give the kids Scripture or something, go ahead. But don't be surprised if the kids throw it away to make room for more candy.