A big thanks to the CDI's and others who made this happen, it was a blast.
I burned 3/4 tank of gas, it seemed like I drove as much as at a DE. Riding with fellow instructors is something we don't usually get to do, as our time is normally needed by beginning type drivers.
It was a great learning session for me, I learned something from every instructor every lap. We all know at least one thing better than everybody else, trading skills by riding with each other benefits us all and I hope we get to do it again. Soon.