I do kind of like the idea of that, actually.
I've read reports that lots of actual clowns have been very upset by the massive influx of "Evil/ scary clown" characters seen in pop culture kind of giving them a bad name, and all these recent "Scary clown" sightings are making things worse for them.
So, I'd be all for actual clowns holding marches or other public events to remind everyone that the real purpose of clowns is to bring joy and laughter to others.