Don't drive to the site. Use a bus instead. Cops will cerainly be writing down licence plates. You could drive somewhere further away from the site and go from there.

If anyone tries to argue for violence, they are probably a plant and you should isolate them.

Take scarfs and plenty of water in case of tear gas.

Do not wear an expensive watch and use a cheap alternate cellphone, because pigs will certainly rummage through it if arrested (and will probably be interrogating you for the lock screen combination).

Have an emergency contact and shelter in walking distance, so you can go there in case of pigs going berserk, until things blow over. It's better if you travel as part of a larger group for this purpose. Someone will know someone.

Crimethinc has a bunch of helpful articles on the topic (following links are ordered by how relevant I think they might be):

https://crimethinc.com/2014/08/14/staying-safe-in-the-streets

https://crimethinc.com/2017/10/16/the-femmes-guide-to-riot-fashion-this-seasons-hottest-looks-for-the-discerning-anarchist-femme

https://crimethinc.com/2003/11/20/blocs-black-and-otherwise

https://crimethinc.com/2008/10/11/fashion-tips-for-the-brave

https://crimethinc.com/2020/09/01/a-demonstrators-guide-to-helmets-everything-you-need-to-know

https://crimethinc.com/2020/12/15/a-demonstrators-guide-to-body-armor-protecting-yourself-against-blows-batons-bullets-and-more

https://crimethinc.com/2020/09/02/a-demonstrators-guide-to-gas-masks-and-goggles-everything-you-need-to-know-to-protect-your-eyes-and-lungs-from-gas-and-projectiles

https://crimethinc.com/2021/01/04/a-demonstrators-guide-to-understanding-riot-munitions-and-how-to-defend-against-them

https://crimethinc.com/2020/08/03/tools-and-tactics-in-the-portland-protests-from-leaf-blowers-and-umbrellas-to-lasers-bubbles-and-balloons

https://crimethinc.com/2020/06/08/protocols-for-common-injuries-from-police-weapons-for-street-medics-and-medical-professionals-treating-demonstrators

https://crimethinc.com/2020/09/24/a-demonstrators-guide-to-responding-to-gunshot-wounds-what-everyone-should-know

https://crimethinc.com/2020/12/15/a-demonstrators-guide-to-understanding-police-batons-and-how-to-protect-against-them

All advice here is great, study Crowd control also everyone loves to kick it in front of the cameras and pigs in instead of keeping a protest moving (just a personal take) but that's usually where you can see the pigs start to gradually multiply, and there's always a boiling point where they decide to attack &/or tear gas everyone. I always felt like keeping a moving marching crowd gave the pigs a harder time to mobilize because you know they plan on using force at some point it's just rhetorical.

You can easily see this Happen by the amount of pigs and the undercovers in the crowd, also paid people by the pigs to do something that justifies use if deadly force. These fuckers usually aim for the leftist to instigate you. Be careful.

There are also times where the undercovers posing as lib protestors will attempt to ID or event "tag" you by trying to take a picture with you very quickly and passive aggressively they might have you a shirt or a mask with som lib shit on it. And then quickly move in for a picture like a politician. Don't remove any of your masks, but know that they got their eye on you after something like that. It's how they mark you, in their Intel, it's like their undercover scouting report those fuckers know who they're charging at when the shit goes down.

Rain coat, umbrella. In Korea we got hit with firehoses filled with pepper spray during a labor protest. Wish I woulda had those things. Goggles may help too.

Since this is Amerikkka, a stab proof vest could be justifiable since reactionaries often bring knives or will try to stab with flagpoles and shit like that.

No cell phone. If you need one, get a cheap one-time burner and keep it off until you need it.

Paint your face using counter-facial recognition techniques, with various colors in geometric shapes.

Goretex hiking boots. For the firehoses.

Waterproof pants. For the firehoses.

Might need some padding around the forearms for the cop dogs. They are trained to go for the forearms when doing a takedown.

Scout the site out in advance if possible. Plan escape routes. Have at least three.

Make sure to bring face/eye protection. Both piggies and anti-protestors have been out and about hitting people with pepper spray.

don't bring your phone, don't take pictures, do wear a mask (you should always be wearing a mask out though), do dress in normal clothes so you can blend into a crowd if you need to run.

Turn your phone's face/ Iris ID off. Attending a protest isn't illegal, but if you'd rather not be seen at the event, then mask up. Don't engage with weirdos who talk to you about guns/ engaging in violence. Walk tf away. The protest is expected to be the largest since Nov 4th, so dont bring a car unless you wanna park blocks down. Bring water!! Counter protestors are counting on you to engage with them, so you can get arrested. Dont engage with then if you don't have to.