This is an interesting idea, but I am wondering. Is it legal? I am in the USA so I would miss out on it, but I would love to see such a thing. Sort of like those mid-evil reenactments. There must be places in Europe with authentic back grounds to give it realism and make it the feel even the participants would believe it was really happening. I am feeling it just thinking about it. I have been role playing such things but if done in a Roman coliseum or Romanian castle would be a life changing experience.
I hope you can do it and post a story line and pictures. Good luck with it.