If you haven't purchased Halloween Candy yet, don't do it until Saturday. Because otherwise you know what will happen. You'll probably end up eating half of it between now and then and will have to go out and buy more!
If you already have purchased, then put it somewhere very inconvenient to access. For example, put it in the garage on the highest shelf or in the attic that you would need to use a ladder to get at. Or store it at your neighbors house - just make sure you tell them they can't eat any of it either!
Yours in health and fitness,