One of the biggest challenges I've experienced as a reenactor is the matter of food at reenactments. Cooking by messes was the norm in the real war, but for our reenacting club, that doesn't work real well. People want to bring their own food, or bring nothing at all.
Over the years, I've evolved a set simple menu of fresh food, easy to cook, the meat requiring an ice chest, and bring enough to share with other men. Sometimes I take home lots of food, but cook it over the next few days. But I've figured out that new guys, like I was once, are extremely thankful for a plate of hot food in the new environment in which they are spending a weekend. And if I can keep them from the modern vendors or even leaving the site to go to McDonald's, then I've done the them and the hobby a worthwhile service.