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.