Most of my advice about Halloween safety for kids revolves around trick-or-treating. First things first, know what your children are planning to do. If they are going to a party at someones house, talk to the parents and make sure you know who is going, what will happen at the party, who will be supervising, and what time to expect your kids to return home. If your children are planning to go trick-or-treating, you need to sit down with them beforehand and plan out what route they will take.
General trick-or treating advice: avoid dimly-lit streets and parks, always travel in a group, carry a flashlight and wear reflective clothing to alert passing motorists, dont enter a strange house or car. You may also want to talk with your child about his or her Halloween costume. Make sure the Halloween costume is comfortable to walk in for several hours, provides necessary warmth, and is safe to wear. Perhaps they can bring along an extra pair of shoes if those wrapped mummy Halloween costume sandals become uncomfortable!
Lastly, talk with your children about your expectations for the time they are out and about, whether they will be at a Halloween costume party or...