How do you set white balance while shooting in a environment where the lighting changes, such as, for a concert or a theater play? I can white balance at the beginning, however, the lights will change constantly.
I think Barry's suggesting that you shouldn't do a manual wb at all. Just use the camera's hard-preset 3200k wb mode. In a situation like you're describing there might not be any effective way to manually wb. You can always tweak the results in post.
As said, you can tweak for an overall colorcast in post- assuming there's ever a moment of neutral light. With a consistent setting though, and assuming there's a section of neutral lighting where skin tone etc . actually matters, you can adjust for whatever colorcast (in post) and be done. If your WB is all over the place in camera there's no way to effectively balance in post. I'd go with the indoor preset, myself given that it's going to be completely nuts anyway and be more concerned with exposure.