I did quite a few sketches in my sketchbooks when I was at a rap gig in Cardiff a couple of weeks ago, but it was quite dark. The stage lighting was set up to light the DJ, not the rappers so I couldn’t see much of almost everyone I scribbled. This performer just had tiny fragments of her face in the light, but that was exciting to draw. It’s tempting to fill in what you know is there, but I stuck to what I could actually see and I think the drawing is the better for it.
scribblah 
I love drawing in low light. There’s a special amazement in accepting the drawing environment that you’re in and just being inside the living moment.
Yes, it might not make much sense to people looking at the drawing but like you say, it’s great to just be in the moment
How you made it might not make sense to a viewer, but I think this is a wonderful drawing. It has a certain verve. It also has a feeling of light so it’s interesting to learn that it was drawn in low light.