Didn't Plasman also say that the parent with whom they were meeting was the same parent who was part the altercation a few days earlier? I find it somewhat unbelievable that this parent would have been Hegarty; she's a vice president of the PTA [link to newtown.sandyhook.schooldesk.net]

Sooo... maybe the 8th person in the room was a different parent who was also involved in the earlier altercation?

I think I've seen this suggested before.