This sounds like the best thing going. How can it be made to happen?
I guess you can try to do it formally, or just do it informally by putting out the word to meet in Woodburn either Saturday or Sunday morning. If you go to Woodburn on Saturday, you are on you own for accomodatons, etc. The Seattle area people could meet up somewhere (Southcenter, etc.), at a certain time, on Saturday morning and caravan down to Woodburn. A meeting place, and time, in the Woodburn area could be specified for Sunday morning, and whoever shows up goes on the Oregon Coast ride.
It would be nice to establish some Crossfire contacts!