low light - How do I choose a lens for a "glow in the dark" indoor/lowlight event?

I was recently asked by a friend to take to pictures at a “Glow in the dark” event center meaning that it’ll consist of low light environment. I have a 320 EX III speedlite that I can use, but I would like to stay away from it if possible. I have three lenses:

• 50mm 1.8


• 85mm 1.8


• 24mm-105mm 4.0 IS

I shoot on a 6D Mark II. Within the lenses I have what lens would you say will work best? How do I choose from these three (or other) lenses?

I’m a beginner and I’m still trying to improve my equipment collection so any advice would be deeply appreciated.