From my following of the situation the organizer spoke with the park police and they set up an area at the white house that is blocked off and if you go and sit

From my following of the situation the organizer spoke with the park police and they set up an area at the white house that is blocked off and if you go and sit in that area you will get arrested. If you look at photos of those arrested you will see a perimeter. Where the park service has screwed the protesters is that they have decided to randomly keep some people they arrest in jail for a couple days, after promising to only issue a $100 fine and be on your way.