Carry a good blade if nothing else. There are a few locations on the human frame where major arteries are accessible to a very sharp blade, especially if you’re on the ground and the perp is coming at you.
Yes, I carry a folder even where I can’t carry a gun (except airplanes, courthouses, and such). Only about a 3” blade, but it’s always shaving-sharp, and I can open it fast if I have a little room to whip my arm.
I just like the mental picture of some of these thugs getting more than they wanted. I’m not trained anywhere within a mile of that extent, but I know some very not-impressive-looking middle-aged guys who could immediately destroy any players of the knockout game.