A fascinating 3700-word piece by Kirk Tuck on shooting high-tech events for high-profiled clients.:
…you need to be able to move fast, not draw attention to yourself and get the shots you need without disturbing the subjects. They are engaged in high stakes business. Your job is infinitely secondary, in the grand scheme of things, to what they are trying to accomplish. And they are scheduled tighter than a space launch. When we shoot corporate shows it’s customary to wear black when you will be moving around the “main tent”. That way, if you need to walk thru the audience or near the stage to get an important angle you blend in with the darkened house. If you wear bright colors you stick out like sore thumb and hundreds of eyes will follow you as you move. […]
Another sound advice:
The real secret to good coverage is to blend in with everyone else. […] Here are two very important photo tips: 1. I never carried a camera bag around with me. In most instances (outside the main tent) I walked around with one camera in my hands and an extra lens in one pocket. I tried as much as possible to look like just another attendee who happened to bring along his camera. Not like “The Camera Guy!”…
Read and learn.