I, too, question what you can accomplish in one hour. Painting at night is tricky, and the motion on stage will make it even more so. I agree that a good finished product could be had if you use a combination of photos and quick sketches, taking them back tot he studio to design the final painting.
It might also help to "practice" painting/sketching this musician from photos you may have available to you, to kind of warm up to her look.
I have done some night/dark painting in pastels on dark ground (black or dark neutral) with success. This is one way to limit your work to the bright colors, highlights, and silhouettes, which could make a pretty nice image if you are able to do this.
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