I know it's kind of short notice, but a few people suggested that I still post about this.
Aki Matsuri is a Japanese cultural festival over in Bellevue. It's a nice event and I've been a volunteer for a few years now. If you're interested in helping out go to this link.
For those that have only staffed conventions, it's a great change of pace and I would highly recommend it. The experiences I've had here have been great.