I was actually just looking into this a couple of days ago. I check the different organizations periodically incase one pops up. There was a usaci comp at pir last year hosted by Kumho Street Warriorz.
There are none scheduled for dbdrags or iasca.....BUT there are 2 this year (woot lol) for usaci.
The first is Sat Aug 16th in Eagle Crest, which is near Redmond. Lucky for me, my bro and sister in law live in Redmond so I am going to try to make it a weekend trip. This one starts at 10:00am
The 2nd one is Sat October 4th at PIR once again hosted by Kuhmo Street Warriorz. This one starts at 5:00pm.
Here is the USACi event list.
http://www.soundoff.org/cgi-bin/schedule/display.cgi?search=1&display_all=1