Done the Fiesta twice. 2007 & 2012. Owners club with reservations the first time.
Just showed up, no reservations, the second time. The reservation requirement depends largely on when you plan to arrive & where you want to be.
IMO the VIP section is too expensive & too overated. Private CGs miles away from the Fiesta grounds are too expensive & too much of a hassle to deal with what with the getting up super early, the shuttle &/or the parking & traffic.
Best place is the dry camping area about a mile from the launch area. Balloons launch at 7:00AM. Most days the air currents have the balloons right overhead this area by 7:15. Some land in a large open area within this camping area. If you want to go to the launch area ride the numerous free shuttles or walk.
The busiest time in the CG is the first weekend. By Sunday afternoon there are plenty of vacant sites. Even more as the week goes by. Water truck & honey trucks are on constant patrol.
Albuquerque is like Alaska, the Holy Grail for RVing. You have to do it at least once.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp
40+ night per year overnighter
2007 Alpenlite 34RLR
2006 Chevy 3500 LT, CC,LB 6.6L Diesel
Ham Radio: VP9KL, IRLP node 7995