There oughta be a law.
VA has one, apparently it was not enforced in C’ville.
§ 18.2-422. Prohibition of wearing of masks in certain places; exceptions.
It shall be unlawful for any person over 16 years of age to, with the intent to conceal his identity, wear any mask, hood or other device whereby a substantial portion of the face is hidden or covered so as to conceal the identity of the wearer, to be or appear in any public place, or upon any private property in this Commonwealth without first having obtained from the owner or tenant thereof consent to do so in writing.
And maybe the mayor or police chief gave permission?