Take a lot of aspirin with you to these presentations. You're gonna need it!
Just be careful with that aspirin. It seems innocuous, but a sufficiently high dose can cause liver toxicity.
On the same note beware of the amount of water you drink to take the aspirin since high amounts of water can cause water toxicity and prove to be fatal.
BTW, saulgoode has some fantastic ideas on your presentation - very good points and well thought out.