We have found that some systems still cause noise that can capture the conference even with the microphone switch turned off. In the last Megaconference, we had systems capturing the conference with no one present in the room just from noise. Adjust your color. Set color or saturation to maximum, and then adjust the hue. Back off on color only if too garish.
Most clients are too pastel.
Do not complain and spoil the show. Provide good lighting on your face. Do not use back lighting. Allow for time delays. When called upon, start talking and keep talking and don't hesitate because you see or hear something unexpected.