I just let my director (my boss's boss) talk me into doing a demo tomorrow on an application that I know very little about. However, I'm deemed as one of the "experts" in the group, as I have played around with the application more than most others, and I do certainly am more familiar with it than she is.
I have no idea who my audience is. I will need to get plenty of sleep tonight so I don't look like a walking zombie like I normally do. And I will need to dress up a bit and put on makeup. And write up an outline. Bah.