Missing Link---
The best I can tell you (and I think it says this in the video), is that Ciro gave this talk during the first half of 2007. He was somewhere on the eastern US coast (Delaware, New Jersey??). I obtained a copy of this talk in December 2007, about a month after my sister was sent a copy from a well-meaning family member.
When I was a JW, from time to time there would be special meetings set up when brothers visited from Bethel. I believe this is the case here - Ciro's talk is too long to have been part of a Circuit Assembly, so it couldn't have been during a regularly scheduled assembly. I would guess that one congregation hosted his visit and several neighboring congregations were invited to come here him speak one Saturday afternoon in a high school gymnaium or Assembly Hall.