I've been in a Medievel Fantasy LARP for going on 10 years. We call our realm and game Darkon, http://www.darkon.org/
, a foam "boffer" combat LARP with classes and spells thrown in. It's one of the largest on the east coast of the US, based in the Baltimore/Washington DC Metro area. There has been a widely circulated Documentary made about it, call Darkon, it's availiable on Amazon, Netflix and has been on IFC. I'm the King of the country of Albion, a Knight of the Realm and currently the President of Darkon for 2010.
One of the best pics of me
My country Albion
Pic of me and one of my guys fighting
A video of one of my Noble Tourneys