One of you needs to go up and talk with them like they are Jehovah Witnesses. Act like you are learning from them. Then ask to carry a sign in protest with them. Then, when you get the sign, start marching like you are one of Hitler's soldiers with a great high step (HHSCIQ), maybe sing a German song and then run away with the sign singing "Three blind mice."
Somebody else video this and post it here.
tia