It is a common tradition for children to go trick-or-treating on the evening of October 31. Some homeowners signal their willingness to give out treats by installing Halloween decorations on their doors, whereas others leave treats out for them to take freely on their porches. The earlier trick-or-treating time is, the younger the trick-or-treaters are likely to be. In most communities, trick-or-treating begins around sunset time, whose time might vary according to your time zone (but usually on...