Unconference

Think of the Kalamazoo unconference, assuming that the official videotape tells it like it was.

Source: wiktionary

As a marketer, the unconference tells me more about what's hot in the marketplace than any other tool I have.

Source: wiktionary

But the fact that there were predetermined sessions went against the whole "unconference" idea, a few attendees said. For them, it was still too much structure.

Source: wiktionary

Unconferences differ from conferences in the way they are organized and the way in which participation takes place. In a traditional conference, there are typically hundreds of attendees. Unconferences, however, have participants who also contribute to the unconference by initiating a discussion, sharing their own experiences, debating, and so on.

Source: wiktionary