There is no magic setting. Set the exposure based on the amount of light. If need be, set the shutter speed to A, ISO to auto, and use the exposure compensation dial to set the exposure where you want it.
What I mentioned above is how I shoot most events indoors and outdoors. I shoot in raw or raw+jpg. Use the electronic viewfinder set to reflect shooting conditions/settings so what you see is what you get. Use the exposure compensation dial to set the exposure you want. This way you can concentrate on composition. And if you need to adjust exposure it can be done quickly. Let the camera do the work for you on shutter speed and ISO. This is the easiest way to shoot an event and not have to worry about the technical stuff.