As Harry Pot­ter mania rises to a fin­ish­ing pitch, we can finally stop argu­ing about who gets to dress up as whom when we go to the the­ater or go out for Hal­loween. Kids with glasses get to be Harry, gin­gers get to be Ron, attrac­tive brunettes get to be Hermione and all the rest can either be Ginny or Neville or Snape. That’s just the rule, and you can’t argue rules.