This is a three day event over a weekend,
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The forum Trump cancelled on was today from 4 - 10pm and is currently ongoing. Each candidate
would be on stage alone with the panel for questioning. The time would be divided equally
among the now 10 attendees. Eleven were scheduled, Trump has backed out, two declined and
three didn’t get invites because the didn’t meet the criteria.
http://takebackevent.com/about/
Who are the two who declined?
IIRC Gov. Rick Perry also cancelled on this event at the last minute back in 2011 when it was called the Palmetto Freedom Forum.
His reason at the time was a lot more compelling than Trump's.