What is "unconference"

n. (context Internet informal English) A conference that attempts to avoid the traditional drawbacks of conferences, such as high entry fees, excessive formality, and bias due to sponsors.

An unconference, also called an Open Space conference, is a participant-driven meeting. The term "unconference" has been applied, or self-applied, to a wide range of gatherings that try to avoid one or more aspects of a conventional conference, such as fees, sponsored presentations, and top-down organization.