Your role is different in some important ways, and they are counting on you to fulfill that role. Keep in contact with the protest organizers to make sure such situations are addressed before they escalate into a problem. Focus in particular on what the police are doing. You probably will not be able to know on the spot what could be important later. Include all details on how to reach you over the next several months.
Locations frequented by protestors are in bold.
In charge of permitted demonstrations.