The Tractor Tavern doesn't do acoustic music on weekends. I've contacted all the others listed here, too. Still waiting on responses from a few.

Thanks y'all. This has been most helpful and I very much appreciate the help.

While I found it difficult to find all the music venues in the area, I did find a lot of musicians - in fact, I think if you live in Seattle/Tacoma area you HAVE to have a myspace profile!