Right because nobody wears masks during Mardi Gras. It's just too uncomfortable.
Beyond that bit of sarcasm, there is still time for the numbers to come down, which we know they are now, and for LaToya to pretend that she brought them down enough to end the mask mandate. Even if not, I don't think most people or Krews are so freaked out about wearing a mask indoors that they would cancel Balls. Beyond that people will still take them off to eat and drink and nobody is going to enforce it anyway.