Oh this is a delight to see a major conference with an Unconference
portion. This is how they describe it:
Enterprise2Open is the "unconference" portion of the Enterprise 2.0 Conference and is open to anyone who would like to attend. This open event blends some pre-scheduled content with an open grid where the attendees fill in the sessions they either want to discuss or present themselves. It is the perfect space to provide the community at large with a place to connect with other attendees and share your knowledge and experiences.