That is why I always bring my own table knife with a 15° full flat grind. Really cuts down on that pesky sharpening time that might let you cool off before the cops come.
True story: I ate at a restaurant inside of a casino and you can't have a pocket knife when you enter for obvious reasons, they gave me a steak knife with a 5" fully serrated edge when I sat down.
Neither do Swiss army knives. That said, I dress western. Pocket knife mysteriously finds its way behind my belt buckle at metal detectors and no one cares to look down my pants after they see the buckle.
I'll remember this trick when I accidentally forget to leave my knife in the car for an event and we just walked a couple of miles from our parking spot to get to the gate. I've had to hide it in the bushes a couple times before.