GRASSROOTS VERSUS BIG ORGS
So far, the 50501 and other demonstrations have had good turnout but not been big enough to draw counter-protesters or unruly actions. As the movement builds and gains influence, this will likely change. Even if the size of the demonstrations doesn't grow, although they probably will.
Often at big marches held by large organizations, the march becomes more like a parade with a lot of marshals. The people that come are meant only to march or participate in preplanned events. At grassroots demos everyone becomes both a participant and an organizer, laying a foundation for more independent political action in the future.
Grassroots actions creates more leaders and fosters a strong community of independent activists.
KEEPING EVERYONE SAFE
One of the best ways to stay safe is to have more experienced activists distributed throughout the demo. Have experienced people who are specifically there to look out, keeping an eye out for trouble. Orange hat legal observers are good too, but you want someone who is doing nothing but watching for suspicious or troublesome activity.
Have demonstrators spread out, particularly on sidewalks in front of government buildings. Not so far apart that individuals can be isolated, but also not in one big lump making an easy target. This also prevents sidewalks being blocked. It also makes the demo look bigger.
If you are an experienced activist and don't know anyone else at the demo, just find the best spot to keep an eye out and walk through the crowd a few times and look for any suspicious people. I usually find a reason to wait until all of the demonstrators have left, or all of the suspicious people have left. And if I can I try to follow them and look at their vehicles for future reference.
(They are usually men, usually alone, usually wearing a hat and non-descript clothing, and rarely holding signs. Sometimes they are law enforcement, but they can be individuals or from groups looking for leaders to target or follow.)
And in these areas with Trump supporting law enforcement, the police are something you need to watch out for too. Are they dressed normally or in riot gear? Do they have paddy wagons parked all about and numbered zip ties hanging off their belts? They don't get dressed up unless they are planning to attack.
And if there are counter protesters, are they protecting them or us? Where are the police standing, facing the demo and a distance away, with the counter protestors behind them? (Mike German's just released book Policing White Supremacy details how law enforcement was trained to fear non-violent leftists more than violent white supremacists, among other things. Well worth reading.)
QUESTIONS FOR ORGANIZERS
If you are a demo that is organized by a local group or chapter, find the organizers, introduce yourself.
Do they have a jail hotline and sharpies for people to write the number on their hand?
Are there legal observers?
Are there lookouts or security and are they identifiable by armbands or something else?
Do they have a first aid kit?
Is there a hand signal or anything that is used to flag problems or summon assistance?
And ask if they need you to be in any particular place or to do anything to assist.
IF THERE IS NO ORGANIZER
If there isn't a group leader just position yourself as best you can. If you can get a good view of the whole demo that is ideal. If not, move around a bit. If you are an activist for an issue or group, go around and introduce yourself and let people know that if they have a problem or see anything suspicious to let you know and that you will do the same.
For the moment, the Trump supporters are still reveling in their victory. To them 50501 looks like Democrats re-enacting their election result demonstrations in 2020. (There's some cognitive dissonance on this theory from the folks that insist that capitol insurrection was antifa and the Democrats.)
But it is best to be prepared.