Every presentation worth doing has just one purpose: To make a change happen.
No change, no point. A presentation that doesn’t seek to make change is a waste of time and energy.
Before you start working on your presentation, the two-part question to answer is, “who will be changed by this work, and what is the change I seek? ”
Every element of your presentation (the room, the attendees, the length, the tone) exists for just one reason: to make it more likely that you will achieve the change you seek. If it doesn’t do that, replace it with something that does.
And of course, you can’t change everyone the same way at the same time. One more reason to carefully curate your audience with your intent in mind.