Seattle International Randonneurs
So this is the touring club that puts on Randonees (also called brevets or cyclosportives) in the area.
These Randonees are self-supported tours ranging from 100km to 1200km in length. The distance is the thing, not the speed.
This is the massively time-consuming sport for those of us who can’t swim or don’t like to run.
Get started here: http://www.seattlerandonneur.org/