room of requirement
  1. unconference space where participants gather to connect, venue for smackdown
  2. during unconference participants use the room to meet their needs at the time e.g. continue conversations, connect and hangout during the unconference "Initially it appears that this room could be all things to all people, always having exactly what is needed for the efforts of the day." Muggles' Guide to HP
  3. also known as the Come and Go Room it is there when participants are in need of it
    "It is a room that a person can only enter when they have real need of it. Sometimes it is there, and sometimes it is not, but when it appears, it is always equipped for the seeker's needs"