the law aside - i went last year and it was so crowded and you herded like cattle shoulder to shoulder. if they did let you in OC (which i doubt) you wouldn't be able to protect your weapon. someone could take it out of your holster and you couldn't even move you arms to stop it.
sidenote - i went last year and saw several shirtless fights, a guy in his underwear urinating on himself, a girl vomiting on another girl and the usual drunken activity that goes on there.