I'm not aware of when the shows are, but you should introduce yourself on the Washingtonians thread in the Where are you forum. Shows are talked about there and they will know when they are coming.
I also believe the next show is the Cascade Spring Show in Monroe. Following that will the a show in Chehalis, then there are the State Fairs, another show in Stevenson, and again in Chehalis probably in December. The two Clubs to check out are the Washington Feather Fanciers and the Pacific Northwest Poultry Association.
I would love to go to all of those, but they are at least 5 hours each way from Pullman (I'm a student so there's no way I can take off for a couple of days). Are there going to be any on the Eastern side of Washington, like Spokane?
I heard that there is a free youth poultry show this Saturday (Feb 20) at the Clark County (Vancouver Wa.) Fairgrounds. Does anyone know anything about it? I only live about about 15 minutes away!