Where will you be presenting? With what kind of equipment? How will the audience be oriented? Where will you stand in relation to the screen? These details should be nailed down in advance of your actual presentation. If you are wise, you will go and nail them down yourself.
When you arrive at the venue, find out where the light switches are, where the electrical outlets are (will you need an extension cord?) how the room temperature is controlled, and whether there is Wi-Fi. Find out where the sun will be at the hour you present. Will it be pouring in through that south-facing window and landing on your screen? If so, you’d better know how to operate the blinds.
Check the lighting. How and where is it controlled? Is it just an on/off switch? Or will there be a dimmer? What quality of light is it? Strong fluorescent? Soft incandescent? LED? Whatever it is, put an image up on the screen and see how the room lighting affects it. Adjust either the light or your visuals accordingly. And while you’re at it, make sure you are lit as you speak. Audiences must be able to see you.
Check the projector and connections. If you’re using your own equipment, that’s easy. But if you’re using an in-room projector, then you must test it. If you don’t, you may find when you begin your presentation that this projector’s color temperature is different from yours. You may find that everything looks yellow or magenta because a connecting cable has gone bad. Make a dry run using the very equipment you’ll be using and you can head off some awkward problems.
Finally, on the day of the presentation, bring a back-up projector. Bring every connector you have. Then get there early enough to switch out any equipment that’s malfunctioning.
My partners once walked boldly into a room in our State Office Building to check the venue for a presentation an important client would be giving the following day. They didn’t ask permission—they just went in and ran the slides through the in-room projector. They found that the mandatory corporate color used by the client was several shades too light when projected through in-room equipment. They darkened the slides accordingly, making it perfect during the actual presentation.
There’s nothing like being prepared.