Apropos of absolutely nothing, a few random pieces of advice that you may or may not wish to follow.
I would also suggest you travel to the protest on foot, or by public transportation. If that’s not possible, park a good distance away and walk in. If you’re ubering (or whatever), have them drop you at a business a few blocks away. Makes it harder to link you to the protest later.
Also get the number of a good lawyer and write it on the back of your hand in marker that won’t rub off. Pieces of paper can be taken from you. Your hand can’t.
Yes. You should definitely take that with you. I’m sure nothing about the situation you’re about to put yourself in could go sideways. Definitely do it. You’re so wise. Do it.