Amtgard
Taken from their webpage;
Amtgard is a non-profit, non-sectarian organization that is dedicated to the recreation of the Sword and Sorcery genre as well as educational aspects of both Medieval and Ancient cultures. Amtgard focuses largely on a Medieval-based combat system but also encompasses the arts and sciences of the time, in a friendly, social atmosphere.
Amtgard uses safe, foam-padded replicas of Medieval weaponry. Anyone aged fourteen years or older may compete in the martial aspect of the game but we welcome members of all ages. There's a place for everyone.
Amtgard differs from Belegarth with their use of lighter Fun Noodle weapons, faster fighting styles, no shield bashing or grappling, and different stabbing rules. Amtgard also features a class system whereby players earn experience points to raise the level of their character and gain access to new abilities and spells for use in certain battle games.