I understand what you're saying, but if you look carefully there is definitely some editing going on. Keep a close eye on the saxophonist and the woman behind him at around 3:16 -3:17.
Good idea.
Designing Systems for High Availability in Critical National Infrastructure always goes down well.
Or I could do them the Queen Mab speech from Romeo and Juliet.
That should break the ice
The solution is simple enough, and you've given the clue to it, yourself ...
Once on stage, deliver a speech to the audience (large or small...). Not for too long, naturally, or they'll all leave.