Open Space
Open Space (aka Unconference) is a way to run meetings in a self-organizing manner with very little upfront planning.
The process involves these steps:
the meeting or session begins with participants sitting together
facilitator greets, explains laws, and introduces the theme
facilitator invites people (hosts) to come up with topics related to theme
hosts come to center and write topics on post-its and announce to the group
hosts choose a time and place and posts these details on a wall
the wall becomes the 'agenda'
participants sign up and attend desired sessions
hosts should have passion for their topics and ability to start a discussion
they need to ensure report of discussion is done and posted on another wall
groups return to gathering area
share comments about experiences of individual sessions with everyone
Four Principles
whoever comes are the right people
whatever happens is the only thing that could have happened
whenever it starts is the right time
when it's over, it's over
Law of Two Feet
"If at any time during our time together you find yourself in any situation where you are neither learning nor contributing, use your two feet. Go to some other place where you may learn and contribute."
References
Harrison Owen's (originator) intro to Open Space - http://www.openspaceworld.com/brief_history.htm
Examples of Open Space sessions - http://www.openspaceworld.org