Although they said that it would never run again, I found that the conference was actually meeting in secret, and I was an invited speaker.
In the break on the last day I went up to the podium to upload my presentation to the computer. MW stopped me in my tracks. He took me in a ballroom pose, and started to waltz me around the lecture hall.
When everyone returned from the coffee break I took my seat next to JG-T to listen to the first presentation of the session. It was only then that I realised with shame that I had completely forgotten to load up my slides – and I was up next.