Note what loos like a fair or concert being set up near-by. This is in fact "Rodeo Ranch" being set up, part of the annual Air Mobility Rodeo competition. In this image, the main "tent city" has not yet been constructed, but it looks like the main entertainment stage is being set up. Large amounts of unseemly debauchery, not open to the public.
These images must be summer 2007ish.