Woops! I guess I could have said something about this a week ago...but Olympia is having its Warbirds Airshow this weekend. I saw some of the show yesterday and today is another show. Skydivers (a team from Ft. Lewis) open the show. Flyby's of the Airforce C17 and Navy FA 18 C, P-51 Mustang, Yak's doing aerobatic, and lot's of planes and copters on display. Soloy has a turbine powered 206 on amphib wiplines. Check out this link.
http://www.olympicflightmuseum.com/airshow.php

I think the airspace/field are closed from 1230-1600.