That`s smashing. Relay. I witness many people loosing their temper during public speech under such a pressure. And that happened to me either.
The only defensive weapon I know is when you decide that all this not about you.
Work, agitate, motivate never aiming your personal coolness. Do it for your family, your friends, for humanity, for your God! But don't put your personality at the first place.
The road to success is a road of humility.