It isn’t, and has not been, illegal to carry knives out in the open in a public area. You don’t usually see people running around with 12cm Fahrtenmesser but it’s completely legal. That’s blade length, to be clear, not total length. This kind of thing. Or things like an Opinel, completely legal to EDC.
And mass gatherings aren’t the same thing as a random public place.
EDCing swords was outlawed in 2008 IIRC, now it’s aforementioned 12cm max, only a single edge etc.
Oh, wait, no: Total temp occupied = occupied after + occupied before makes more sense. It’s liberated which is not included in any equation and no bar shows currently occupied. which should be temp occupied - liberated.