David Wilcox will be chairing a session on communities of practice and wants to demonstrate their value via Knowledge sharing by milling about. I like his description of what he plans to do to help people appreciate the nature of CoP's. I'd love to be there myself.
In the other session we hope to get everyone at the event working out how best to share good knowledge through communities of practice, probably by simulating this with a great deal of milling about with large badges, requests for help and offers of assistance.