Here are a few I'm going to.

www.northolympicmustangs.com
www.irrigationfestival.com

Also on May 23rd is a free show at the seven cedars casino. Usually if the weather is good the mustang show will hit 150+ cars, tons of mustangs of course.
The irrigation show will hit 200+ car and bikes this year and the casino show will hit 100 or so.
All are great shows in this area, so if you want to go on a cruise come on over!