• Seating capacity is generally stated assuming theatre style seating.
  Divide it in half for an estimate of how many a room holds in a circle.
  For example, if the seating capacity is 120, the room will likely hold 60 people.
• Unobstructed wall space large enough to hold the agenda, with room for the news room.
  Figure 10 feet for 20 sessions.
• Sufficient break-out space
  Assume 1/3 of the people will post sessions.  For example, 60 people for 3 sessions requires about 7 spaces that will hold about 6-10 people each. The calculation: 60 people/3 = 20 sessions; 20/3 = 6.6667 per time period
• Permission to use tape on the walls (or an alternative means for hanging signs, session notes, and news)
• Adequate space for registration table, food

• If computers will be used for notes, adequate access to electricity
• A setting conducive to good conversation

Nice to have:

• Natural light
• Convenient rest room locations
• The more square-shaped the room, the better