They may ask you to leave the school grounds. Not saying it is legitimate, but they might ask.
Kostic up in NH got told to leave school grounds, even though he was within his rights to be there, apparently the cops took the position that the school could ask anyone to leave that they wanted to, and were going to enforce it.
That might be BS but they were also pretty firm about it. So you will have to decide if you want to be arrested at that point, BS or not, if it comes to that. Whether or not it is illegal , at that point, doesn't get you out of the back of the cop car.
I have no idea how it is going to play out.
Fresh batteries for your voice recorder. IF possible have a friend or 3 with video cameras.
And I know you know, but don't let them bait you. They may have thugs purposely get in your face. Don't take the bait.
Keep your eyes open and your chin up, and smile.