I was actually hoping to see these ... launch their own version of TAM, to see how hilariously disastrous this train-wreck would be. Unfortunately, at the rate they're going, this just doesn't look possible anymore...
There would be zero attendees.
It appears that there has already been one, and the room did not look exactly empty. Several of the faces seem somewhat familiar from e.g. FtB: http://www.flickr.com/photos/centerforinquiry/sets/72157630004212926/with/7317186890/
The next one will be held this May, with some names on the speakers list that even I recognize: http://www.womeninsecularism.org/