White balance for stage events: I balance according to the nature of the lights. If the lights are tungsten, I set tungsten. If the set designer is throwing gels on the lights, I let that happen--that's the look intended.
As has been mentioned, with video the eye is a lot less fussy about noise, so I raise the ISO as necessary to get workable apertures. But in post, resist the attempt to pull up shadows that don't really have detail in them. Let those go black, which is another thing that is much more acceptable in video than it might be in a still image. The primary direction of the main light is a factor you want to consider when you set your camera position.
With the frame rate at 29.97fps, I keep the shutter speed at either 60 (preferred) or 30. The shutter speed factors (such as the 180 degree rule) have been noted, but I'd add that in my experience viewers are comfortable with shutter speeds between 1/30 and 1/90.
Slower than 1/30 and the blur become noticeable to most people.; faster than 1/90, that "staccato" look starts to become noticeable to most people. Of course, either may be your preference for a particular effect. In general, though, you're okay varying shutter speed between 1/30 and 1/90, IMO.
Shoot in manual for both exposure and white balance. The primary reason is that in auto, the camera will adjust as it thinks necessary according to what's in the frame composition even when the actual light has not changed. So, for instance, the spotlight on the main singer may be constant, but the lights on the background or the rest of the band dim or change color...and the camera adjusts to the background changes, which you would not want.