On the plane back north to Vangroovy - exhausted and brain filled with ideas and some enjoyable observations, here are a few:

Human 2.0 - This Dmitiri lad is the real deal. His themeing session was outstanding as he took the packed standing room only (really) crowd from "what is a theme" all the way through the basics and into crowd-suggested nuances (i.e. themeing per node or per view or per block etc.).

He's a keyboard shortcut wizard, has a great sense of humor, a natural public speaker (with just a wee-est quaver in his voice) and he knows this Drupal and php stuff solid and drives his Mac like a virtuoso. He doesn't post social media stuff anywhere and this was hist first real "meat space" interaction with his community.