Pacific Commodore Expo NW: supported by the Fresno Commodore User Group, the Portland Commodore User Group, the Puget Sound Commodore User Group (of Tacoma), the Commodore 64 Enthusiasts of Greater Victoria, and most likely, the Seattle Retro-Computing Society
I've just booked my hotel for PaCommEx. I will be at the Knights Inn in Tukwila, about 8 miles south of the Living Computers: Museum + Labs. The more inexpensive hotels are in that area known as SeaTac or the Seattle-Tacoma International Airport area. You could use Trivago.com and find other hotels in the area.