Go to AKC's website at www.akc.org and click on the Events tab and then select your state and select the type of event and in the case of traditional dog shows the event type is Conformation. You can get a list of shows in your area.
Petsmart does not host "real" dog shows. They do like the other poster said and have like fun stuff shows like dress up, smallest dog, biggest dog, best trick, ugly dog kind of contests but not actual dog shows like you see on TV. Petsmart also sometimes offers obedience courses.