Here's a cautionary tale that you should pass on to your readers. Once upon a time, I was working for a catering company and we were hired for a child's 6th birthday party. One woman brought in a big, beautiful posterboard with fanciful designs and chocolates stuck to it for the kids to eat. How nice! Less nice is that she used straight pins to fasten the chocolates. I found this out when a mom came up to me holding a piece of chocolate with a needle sticking out and saying, "Is this how it's supposed to be?"
Um, yeah. Needles in chocolates?? That's supposed to be an urban myth! Let's keep it that way.
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If you or someone you know is looking to wow a room full of children *without* murdering them, there are a couple of FDA-approved ways to attach goodies to the backdrop of your choosing. I can only assume this incident happened before the show Ace of Cakes was televised, because now it's fairly common knowledge that you can use edible glue for all your fancy-dessert needs. In fact, if you have running water, you are one ingredient away from making your own clear, edible glue at home.
Alternatively, if for some reason you have a craving to attach wrapped candy or little toys to posterboard, some sticky-back velcro will do you right.