Bring some paper, tape, and markers to create whatever message necessary. I can envision needing signs with arrows pointing downward saying “ACORN Plant” (pun) or “Code Pink Poser”, “He’s not with us”, etc.
In DC.....WE HAD this infiltration problem....Gathering of Eagles....Several Viet Nam Vets dressed in black leather motorcycle gear surrounded perpetraitor.....politely took their sign / poster, and tore it up in little pieces and handed it back.
Intimdation of appearance and numbers, preclude any violent reaction.....you don’t pull on supermans cape...you behave.
You can also smile and make polite comments.....”you reaally don’t want to be here, do you ?” and provide a polite / silent / 6 person Escort group surrounding and shadowing their pathway...always polite...smiling.
Yelling also works....but NO TOUCHING while Screaming.