Join us at AgileYork for an informal event - "Agile Lean Coffee".
At the beginning, people write on notes what they want to discuss about (you can suggest 0, 1 or more topics). Then people vote for the one they find the most interesting. We start by talking, discussing, debating about the chosen subject.
If we have enough people we can have more than 1 group and people can move from one to the other at any time.
At the end, we gather and we do a little summary of the topic.