Have a prep call with your champion before the demo. Identify who is in the room, what they want to get out of the call, and how past demos have gone.
Connect what you're selling to something that hits the P&L. Get one deep business impact, and tell one story that shows people that you can solve their problem.
Get your prospect to tell you a story by using "typically" language to help prompt them with ideas that typically come up.
Ensure the problem you are solving is not an isolated incident. Ask: Is this happening frequently, or just a one-off?