Hi, this is Mark Emiley from the WAHA. We've asked the clubs to submit information on their profiles and only a few really chimed in. I'm going to work on them a bit more this year.
As for "most structured" I'd agree that GEBL and CBG are the most. The Alers have a great club but is a bit more social. I love the North Seattle guys as well. Great dialogues between them and fun meetings. If you are up North, BREW is a great new up and coming club to check out as well.
Anyhow, lots of options!