On Halloween night, my son had his first trick-or-treating experience. My husband and I hadn't mentioned it until it was clear he knew it was a thing — honestly, we weren't sure we really wanted him to participate. As a child with food allergies, there are very few candies he can have. Plus, we aren't wild about introducing him to more opportunities for sugar.  But he was fully aware that people would give him candy if he just rang the doorbell and asked. I was trapped.