You aren't going to get a clear answer from any NOPD cops because there is no clear answer. If you are being scrutinized by the NOPD during Mardi Gras it probably won't be because you accidentally exposed your firearm on a parade route. I hope you have better control over your weapon in such a crowded place. It will be from getting into a fight, drinking too much, being disorderly, not following a simple traffic command from the cop, arguing with your wife/girlfriend, pissing in public, parking illegally, etc etc. Add a gun to that mix, even a lawfully carried one, and you are going to end up in the cage to be sorted out later.