I've done almost all of these! Just a few more to go :)
101 Things to do in Seattle...
Treehouse Point (rentals), Issaquah, WA. just a few minutes outside Seattle.
Pacific Northwest Summer Fairs & Festivals -- A comprehensive list of outdoor events in Oregon & Washington
Long Beach, WA is well known for its Annual Washington State International Kite Festival
Ten Best Things to do at the Washington State Fair - List News - MyNorthwest.com
Bavarian Christmas in Leavenworth, WA
Capitol Hill: Seattle’s Hipster Haven >> A great list of places to visit. I really want to get to Seattle this year!
Salmon Days Festival in Issaquah, WAhttp://www.stopsleepgo.com/vacation-rentals/washington/united-states
Seafair Pirates landing at Alki Beach to kick off Seafair