FFG has posted the locations of the US Regional Tournaments for Armada and their other game systems. You can find the full list here.
Some has already put together a map, so it is easy to find the event closest to you. Check it out here.
I am actually planning on running the event at Dice Age Games in Vancouver, WA. If you're able to attend that one make sure to introduce yourself as a reader of the blog. I'm also eyeballing the event in Tacoma, WA. It's close enough that I may head up there so that I can play in a regional as well.
Hopefully FFG will announce the prize support soon!