I noticed in another post that the stormtroopers use sintra a lot, they might have more tips on their boards (
501st website). Better yet, hit a Star Wars, RPG or a few other sci-fi cons. They often provide security services and in general are very helpful.
Oops, 501st doesn't have a public forum, but some of the sites listed under resources do; like
whitearmor.net, they have a construction section in their forums.
Star Wars Celebrations (nt sure if they're going to do anymore) and GenCon (anually in US and Europe, and maybe Austrailia) are run by
GenCon
Origins is in Ohio (US), Dragoncon in Georgia (US), comiccon in San Diego (US)
for some European cons go to:
Convention listings,
European SciFi Con (Copenhagen, better get hopping, it's this month)
I can't guarentee the 501st will be at any con; but even if the 501st doesn't attend some of it's members are likely to. Especially if it's a big con.