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1. A topic. This is what will attract the right participants to come. It can be anything. For instance, you can convene an unconference on "Creating a Sustainable Campus". You need to determine what is a topic that will be relevant to the people you want to engage.
2. A space. Ideally the venue has open space for people to gather at the beginning. You can use a space that has a number of breakout rooms so that each topic can be assigned to a room, or use a large open space with easels, whiteboards or paper on walls in place of rooms.
3. Facilitator(s). Most of the unconference will be run by attendees, but the role of the facilitator(s) is key in explaining how the unconference works and crowdsourcing the agenda from participants (more on this below).