It's this weekend! I went last year and it was a great way to check out a lot of brands. A good amount of popular microbrands and some others like Christopher Ward go. I'll be there Sunday AM! I have no stake in the show, just a happy attendee from last year.
I think a few ppl here are in Seattle. I probably wouldn't drive just for the show unless there's a specific microbrand you really want to check out. But if you're in-town, it's a no brainer. The guy organizing is great too.