It sounds like you have created a wonderful learning environment for your group of 8 facilitators. When I did my first two Open Space events I engaged a consultant to coach me through them. But I didn't think to have here come to the event itself to coach me in the midst of the experience. That would have been a rich experience (but pretty expensive). I look forward to hearing how it goes. I am also interested in hearing how a collectively lead Open Space goes since it sounds like they will be working together.
Joe Paul