Accept my complements on the approach. Very cool.
[Edit: Keep it up, and I wouldn't describe any of this as critique!]
Slide 9, "Notice how de-emphasized Start is." Following the arrow, I see that "Find" and "Start" are the same size and believe are emphasized similarly in the header. What cue am I failing to notice that one is de-emphasized?
A subtlety that's lost is between Slides 26 and 28 the user has two separate flows and browser sessions. It doesn't come across clicking next,next,next without reading your text.
[Edit: I didn't notice there were titles, so the only recommendation I have is to put something in the center of focus -- a graphic, a blurred out gmail inbox, a "later that day" film satire, etc.]
On 35, I had a different reaction to the facebook button there. This flow seems like it's based on creating a non-facebook account -- most people here in the flow already have signaled to Meetup they don't want to use fb. Why ask again? It seems like an unnecessary widget that may carry overly strong emotions for some customers. I wonder if this hook successfully converts non-fb users to fb users.
On 44, what was the initial goal for creating an account? Wasn't it to do something specific within the group? At 44 it feels like this flow was a glorified "sign-me-up-for-the-newsletter" form instead of joining a community. Do you have any thoughts about what should be changed at this step in the flow? Should users get dropped back on the PDX meetup page? Should users get introduced to actual neighbors, much like a host would when you show up to a party? Does slide 44 always work that way for all meetups?
[Edit: Good point on 45-47, I guess I expected to see the whole page 48 be in orange pen! That flow looks very confusing to me, and I think I was trying to nudge you to call it out if you thought so, too.]