All rightly then. Maybe you can make us a "training" vid on exactly how to do this?
If you are carrying inside-the-pant on either side (in other words, not your back) then you could just let your arm hang to your side and hold the gun inward toward your body in a large crowd. Perhaps aided by putting your hands in your pockets. If its at your back, simple enough to just cross your arms behind you to do the same thing. If a significant other is with you, have them put their arm around your back so they can help keep tabs on the firearm as well.
All kinds of ways to "hold" the gun in a crowd without actually wielding it.