Create a sense of urgency. A compelling reason to act now. The ability to create a fear of loss is crucial to your overall success. Get a roadie to push the buttons, dim the lights, and pass out the handouts. Arrange it before the talk starts.
Attention spans are short and people are impatient.
Get to the point. Make good points. Make concise points. And make an exit. Even if you stink, your story can save you.