All right, so it's not quite a "Kilt Night," but it's in the same spirit.
This weekend (Father's Day) is the NW Summer Brewfest at St. Edwards State Park (North edge of Lake Washington).

http://www.washingtonbrewfest.com/summer/index.html

I went for the first time last year and had a great time with some incredible microbrews to boot.

There were plenty of kilted brethren, and I'll certainly be one of them. I'm planning on going Sunday to hear Maggie's Fury. Anyone else planning on going?