Rose,
It may seem like just clean fun, but it is really a sneaky way the devil tries to get his foot in the door. Better to not even give him an inch. My personal view of this day reserved for glorifying evil and wicked spirits is that a real conscientious Christian should have nothing whatsoever to do with it. Saying that, I readily admit that it took me a while to come to this conclusion. I wish I had learned it earlier.
Proverbs 22:6 Train up a child in the way he should go: and when he is old, he will not depart from it.
Train your kids to have nothing to do with it, and they won't be able to miss it as we, having observed it did. That includes no wearing of those costumes, no purchasing candy for kids, or trick or treating.
I know, many Christians are rolling their eyes right about now, but it is simply not God glorifying. You want to buy the kids candy, buy it to eat the day before or the day after. There is no reason to do anything to bring attention to this day that has come to represent the fun of evil, demons, witches, Devils and goblins.
Here are some articles that may be helpful in your information quest.
http://www.mountainretreatorg.net/searchit/searchit.cgi?halloween