Try looking through campgroundreviews.com
for parks near the cities you want to stay. I fear if you haven't made reservations that you may be out of luck as this one of, if not the biggest EAA fly in next to Fun N' Sun.
I always wanted to go but have never been able. Kind of like Sturgis for bikers, or Moab for Jeepers'. Perhaps when I retire. Have been to the EAA fly in here close to home at Arlington WA many many times.
Have fun and please please please post pictures of the cool aircraft. Myself and many other aviation enthusiasts would love to see them.