It is a come one come all State tournament. This includes all Folkstyle, Freestyle and Greco Roman USA Wrestling events. You can buy a USA Wrestling card at the tournament or if you want it before you can sign up here. If you do it at the door and they ask for a club name, use Naperville Wrestling Club. I suggest signing up for a USA card ahead of time to make things easier on the day of the tournament.
More information is on the signup page.