Just had a quick look at the video you posted and thought I would add a little feedback, I see you have 60 minutes to do a presentation
trust me that's a long time for a presentation.
I personally would be setting out my demonstration plan with a little break in the middle for a question and answer session, and aside from the great suggestions I would try and make FUN, be relaxed with the demo and your casting......every person that comes to watch has to leave your demo feeling like they want to get in the water and get casting, the easiest way to make that happen is to be relaxed and make the demo look easy and fun..... Interact with everybody there... be approachable to everyone watching.
I would take enough rods and line that I can change my set up depending on where my demo is, your demo might be on a nice section of river beautiful sunshine and lots of room, or it might be on a windy day on a stream, preparation is everything especially if you have 60 minutes, looking at the video I must admit it would not be my set up for a demo.
One other thing I would add is at the start of the demo, talk to everybody a little about being safe while fishing, we have to do this here in Scotland, on almost all of the Spey if you don't wear a safety inflatable vest/ jacket................ you can go home.
Anyway have fun, make it fun and relax .... the rest will flow, I have set out many plans for a demo.... some of the best I ever did went totally off track... but everybody had such a laugh.
DTX Pro Staff.