You may be photographed in public places as there is no expectation of privacy is such areas. You also may publish a person’s likeness (obtained in a legal way) so long as it is not for commercial gain and is not slander. One might argue that neither is present in the situation you point to so long as the posters stick to the facts and do not call the attendees “anti vaxxers” and only state that they attended an event purporting to support such a position.
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