Not medieval, but I once participated in a 3 day civil war re-enactment. Pretty much everything was period, with a few exceptions. One guy had a bong that he was hiding from the older guys, kek. I wore modern socks and underwear but some guys even had period accurate undergarments. As far as the actual camping part though, it really wasn’t that different than a regular camping trip except for all the less comfortable, if more kino, gear. No speakers were allowed but there was a guy with a fiddle which was fun
