Even if you have many rooms as we had, limit the tracks to 4 rooms so the attendance does not suffer.
Make sure you have at least 8 rooms for the event so sessions will be smaller and more discussion (many to many conversations) take place as opposed to one to many lectures. 4 rooms is not enough.
Make sure there is plenty of gathering room in front of your wall, people will want to gather round.
Don't put the wall in one of the session rooms, People will want to look at it mid-session sometimes.