I feel like I know the answer to this, but for some reason I can't seem to properly wrap my mind around this.
I understand when there's music, partying, and dancing and what not, that the BG is quiet and dialogue is done. Then you record your BG walla (or post inserts their own) and the scene is done. I've done plenty of those that have turned out great.
Now, What happens when you have on-screen dialogue along with people clapping and cheering in BG? For instance, a scene with a politician walk and talk through a crowd, or someone at the podium in front of a crowd. Whenever I see these scenes in a movie or TV, I feel like there is no possible way those people are fake clapping.
After quite a few years of doing this, I have yet to encounter the situation even while working for other mixers. So I'm looking to my fellow mixers for some information on what seems to be the normal protocol.
Cheers... literally.