At the beginning of this year I went to one of the most fun and educational unconferences I’ve ever been to; Play4Agile [web].
Typically at an unconference, the agenda is created by the attendees at the beginning of the meeting. Anyone who wants to initiate a discussion on a topic can claim a time and a space. Unconferences typically feature open discussions rather than having a single speaker at the front of the room giving a talk, although any format is permitted. This form of conference is particularly useful when the attendees generally have a high level of expertise or knowledge in the field the conference convenes to discuss.
The main topic was about games in agile. How to use games for explaining certain agile concepts, apply gamification in learning, use existing games as a metaphor for real life situations, etc.
Last year it was sold out in under 15 minutes, so this year the organising committee reinstated that one will need to apply in order to join.