@dajbelshaw All valid points...With your list as a starting point, mine might look like this at minimum (minimalist here):
1) Diversity, both from presenters and content, that makes you think different;
2) Time to reflect and try (if participant wants to)
3) Shorter sessions (30 mins) because brains like that with option to access more detailed content
And, like you, I like space for people to catch up and share ideas/insights.
Yes, Doug, are you going to blog this? 🙂