That's really why I was hoping to hear from someone involved in planning. If this event is permitted, will have infrastructure constructed (ie a stage, gates, etc) and has a public schedule of speakers, etc along the lines of the Women's March in 2017, the March for our Lives in 2018, or the various Marches for Science, then I think it's much less likely to see a violent crackdown by the administration.
On the other hand, if this is more along the lines of the airport protests against the travel ban in 2017, the anti-Iraq War protests in 2003, or the 2020 uprising protests, which were all MUCH less structured and had a much more confrontational vibe to them, then I think there's a greater likelihood of a violent crackdown.
Feel free to steal/copy.
I feel like the phrase "Deny, Defund, Depose" could become a very powerful slogan if it takes off.