YAPC::NA::Chicago can now take registrations for its "Master Classes". You can sign up for the two day Learning Perl (taught by me), Intermediate Perl (taught by Randal Schwartz), or Perl Best Practices (taught by Damian Conway).
Don't wait until the last minute to sign up for Damian's class. He needs enough people in the class to pay for his way over here.
The other two courses are the same ones we teach at all of the Stonehenge trainings, although we've compressed it into two days. That's about twice the Perl density at a fraction of the cost, giving you a double bonus!