I recommend a background check for speakers at any meeting in which the stage is decorated. I'm talking about the background your stage creates for the people watching and listening whom you hope will be focused on said speaker. look at the stages in this composite image.
Both meetings happen to have been at the Roosevelt, in New Orleans, but they are not unique in that their viewers, especially from the rear, must pick out the speakers from bright and busy backgrounds. My suggestion, after shooting meetings for 10 years, is to create a background, or the function of changing to a background, that is subdued and not distracting while your speaker or panel is on stage. I know that may require some tactful suggestions to the folks at your venue
I know you want your attendees to look at the stage rather than at their phones during presentations. A simplified background will make that easier.