It's not too early to start pimping this event. The official dates are May 31-June 2 but folks usually arrive before that or depart after. Expect to see 100+ Zs, Gs, GT-Rs, and other Nissan's plus 200+ people! Expect to hit some of the most spectacular roads you'll ever drive in southern Missouri and northern Arkansas. I don't remember the registration fee but it is minimal and rooms were only $55/night last year.
One of the great things about Branson is that 99% of the people stay at the same hotel. That makes for a lot of "inter-acting" and socializing. Some of the socializing lasts all night!
Registration will not be open for several months but mark it on your calendar now.