Currently the Cirque De Soleil is in the vast parking lot for the Expo Center. Every April they have the largest automotive swap meet in the Pacific Northwest there and at the Raceway next door.
They have everything from massive garage sales there to circuses and gun and knife shows. Parking is not free but there is plenty of it. Now you can take the train right to the east end of the Expo Center Parking Lot and some large hotels have been built very close by.