Reenactments are fantastic! I used to photograph at War of 1812 events, however now I actually participate in them as a soldier (British of course). I plan on bringing my 4x5 along and getting portraits of other reenactors this season.
Note the dates of the two reenactments mentioned above. They are not the weekend of the gathering. You are certainly welcome back then. I just want to be sure you don't build expectations that can't come true.
"If you want to be famous, you must do something more badly than anybody in the entire world." Miroslav Tichư