I would attend this presentation.
I understand the importance of turning over every stone. I have not heard of the examples that you mentioned; I have copies of NYC marriage licenses, but have no idea if any of them had any attachments..
I would want to hear specific examples of what to look for, and where/how to find them. A written list would be helpful, rather than us trying to take notes as you are speaking.
Since I live across the street from the Ackman Ziff Centre, I would really like it to be offered there!