I am a member of the 501st Legion and the Rebel Legion Charity Organizations.
Here is the 501st Charter:
“…The Legion is an all-volunteer organization formed for the express purpose of bringing together costume enthusiasts under a collective identity within which to operate. The Legion seeks to promote interest in Star Wars through the building and wearing of quality costumes, and to facilitate the use of these costumes for Star Wars-related events as well as contributions to the local community through costumed charity and volunteer work…”
In the 501st I costume as a Stormtrooper and in the Rebel Legion I costume as a Havoc Squad Trooper from the video game Star Wars: The Old Republic.
You can see more at my official page http://www.facebook.com/TheBalgosa