Need ideas on how to keep hotdogs warm at an outdoor party?

I want to serve hot dogs at my child's pirate party but they will be set up in boats made of cardstock with skewers holding a pirate sail stuck in it. Is there anyway I can keep these decorated hot dogs warm? I'm not serving the food at a certain time it will be buffet style so whenever someone gets hungry they can just grab a hotdog. I was thinking of keeping the hot dogs plain and decorated for display and everyone can add their own toppings.I will keep the chili warm. but I dont think I can sit the decorated hot dogs in a pan above any fire.