I'm not usually a fan of performance art.
But here's my idea:
I think that people should dress up as the Dursleys and go to school board meetings whenever the Harry Potter books get challenged. They can stand up and speak out -- in character -- against Harry Potter and magic. It would be SO COOL.
Obviously, the people that want the books banned (even though they haven't even read them) wouldn't get the joke. Hah.