CAST is a special conference because of its emphasis on open discussion and critical thinking.
For example, all speakers, including keynotes, are subject to unlimited questioning. If the discussion of a keynote goes beyond the end of the keynote time, we either move the next session to a new room, or move the keynote discussion to a new room. For example, the “questioning” for a keynote by James Bach included a full critical counterpresentation by one of the people in the audience, followed by a long debate. Several 1-hour track presentations have morphed into 2-hour (moderated) discussions.