The dates have been confirmed. The officially listed dates are May 31st and June 1st HOWEVER those are the dates for officialy events. Friday is drag racing and Saturday is the car show.
As I stated earlier, most people, including myself, start arriving Tuesday and spend the week driving the great roads in southern Missouri and northern Arkansas. Maps for suggested drives are provided and you can take off on your own (which is what I usually do), start up a group, or join a group. One of the drives you drive your car onto a ferry and ride across Bull Shoals Lake either from Missouri to Arkansas or vice versa.
If you're on ChicagoZ.com there's a crew from there that comes down.
Re.
Branson Z Fest 2013 website, I'm told it's being polished upand should be open soon for registration.