Hi Oldsalt,
Nice NAPCO and +1 on the "none that I am aware of". But, I too would be very interested in a local gathering.
Do you have a copy of the Northwest Automotive Events Calendar? It lists local shows and events. The next show of interest to me is the Monroe Swap Meet Oct 8-9. This group usually has some presence at this show.
http://67-72chevytrucks.com/ I also think the BC group is pretty active but have never joined them.
I know where Samish Island is. If you want to sponsor a get together count me in and thanks for posting the question.
