Open Spaces

There is a slot for Open Spaces, which are proposed by the participants during the conference and people sign on the spot on Friday.
They have an open space format, following the four principles and one law described in Owen, Harrison. "A brief user's guide to Open Space Technology":

• Whoever comes is [sic] the right people
  ...reminds participants that they don't need the CEO and 100 people to get something done, you need people who care. And, absent the direction or control exerted in a traditional meeting, that's who shows up in the various breakout sessions of an open space meeting.
  
  
• Whenever it starts is the right time
  ...reminds participants that "spirit and creativity do not run on the clock."
  
  
• Whatever happens is the only thing that could have
  ...reminds participants that once something has happened, it's done—and no amount of fretting, complaining or otherwise rehashing can change that. Move on.
  
  
• When it's over, it's over
  ...reminds participants that we never know how long it will take to resolve an issue, once raised, but that whenever the issue or work or conversation is finished, move on to the next thing. Don't keep rehashing just because there's 30 minutes left in the session. Do the work, not the time.
  
  
• The "Law of Two Feet" or "The Law of Mobility", says:
  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 someplace else. In this way, all participants are given both the right and the responsibility to maximize their own learning and contribution, which the Law assumes only they, themselves, can ultimately judge and control. When participants lose interest and get bored in a breakout session, or accomplish and share all that they can, the charge is to move on, the "polite" thing to do is going off to do something else. In practical terms, Owen explains, the Law of Two Feet says: "Don't waste time!"