Amtgard?

      Amtgard is a non-profit, non-sectarian group devoted to recreating elements of the medieval, ancient, and fantasy genres. The thrust of Amtgard is both recreational and educational, with major group efforts devoted to reconstructions of medieval combat. Amtgard weapons are safe, foam-padded replicas of the real things. Anyone may join.

To become a member you must:

1) obtain a copy of the handbook (free online at the official site) and read it.

2) develop a persona and persona history.

3) make a costume for yourself that is fitting to your persona.

4) fill out a membership form and waiver and turn them in to the prime minister. Minors must have their waivers signed by their parents or legal guardians. Minors under the age of 14 may not participate in combat without special permission from the monarch.
 

There are many chapters all over the world. The local group has been around for two and a half years. Here are some links that might help you out:

www.amtgard.com

www.pegasusvalley.com/armorguild