i don't know anyone from the US going. i wasn't invited by a swedish friend of mine.
what i know of in the states, there is Prog Power in Atlanta, Milwaukee Metalfest, and a few others.
To improve technique and of course trying to keep all as clean as possible. I know my own limits and speed limits and so on I never play anything I'm not capable of. That wouldn't make any sense. After three years of playing I tried to play everything as fast as possible and that sounded, I would say, like shit, and I didn't realize that if I'd play bit slower things than I was capable of playing then everything would sound much better.
--Aleksi Laiho - Advice to Play By