Kerrigan, we were looking to go to Tacoma for our first LCCA convention, but noticed that also. Since layout tours are a big reason for attending a convention in an area we would probably never see otherwise, I, too, was disappointed. I thought maybe they would be announced later, so contacted the convention co-chairman.
He sent a very courteous, prompt reply, but basically said they could not find layouts in the Tacoma-Seattle area willing to host a tour and able to host the size of groups that would come by. Sad to say, that means that Tacoma will not be my first LCCA convention.