Silence is golden.
He also serves who only stands and waits.
Less is more.
There is so much wisdom in these seemingly pithy phrases. Think about how much better informed, how much more aware, how much more confident you are, when you are prepared.
And planning includes not only the preparation of research and writing a presentation, it also includes everything about your environment before you begin to speak.
The gold in your presentation will be your ability to notice and absorb what is going on around you before you begin to speak and to adjust and change, in the present moment, to accommodate what you think, feel and see needs to be tweaked, to further custom your presentation to this audience.
So challenge yourself in your next presentation to be that much more aware. Good Luck