It's a moot point because like Adam said its not the right camera for live events.
The manual specifically says not to change the gain while recording
https://www.manualslib.com/manual/70...0.html?page=58
Normally my practice is to adjust the aperture for exposure because dof is so large with 1/3" sensors but in this case to keep the proper dof of the stage I would lock in the aperture and adjust the gain as needed. My eng camera has a toggle switch with 3 preset gains. It also can gradually transition so it's not noticeable while shooting.*
I have no desire for 4k either. I'd rather have the low light performance than the higher resolution.