Matrix had a speaker slot in both events; the first talk was "Proposing an open interoperable signalling layer for WebRTC" (slides).
As I was talking to people in the tea-breaks between sessions, I was actually surprised at the amount of people who not only knew about Matrix, but who had been following eagerly since the early days, and had questions about specific features and recent developments!
Later in the day it was time for the Kranky Geek, and the talk then was a bit more technical: "Interoperable HTTP Signalling with Matrix" (slides). The talk included a "dangerous demo" where we made a WebRTC call from our Matrix iOS App to our webclient for the first time - thanks to the OpenWebRTC team for helping us make the demo!
What's great about these kind of events is the feedback and discussion following talks; lots of people have relevant experiences and opinions that they are happy to share, and of course questions on how exactly different features actually work.
It's always great to meet new people and have lots of various discussions. Hopefully we have got a few more people interested in Matrix - we have already seen some new joiners in the #matrix:matrix.org room!