Documentary of Night Time Event with Wall Projections

[bolshevik]

Hello--

 

I am shooting an event in a couple of weeks and need advice. It will be a multimedia deal with multiple projections happening during the event so the overall lighting has to be very low. At the same time, I am charged with filming the people as they look at the art, interact with it at specific stations. How does one begin to light this kind of thing? Should I attach just a small light to my camera rig and light whoever I happen to be shooting? I don't want the lights I use to take away from the mood of the event or ruin the projections but at the same time I don't want a grainy, muddy result. Any advice?