I've found this when I looked at Nebraska Invitational page. They claim to be part of this chain now. http://academyballroomint.com/rising_star_circuit.html
Nebraska Invitational is (or was) an independent competition. I did it a couple of years ago, since it's a) not too far from where my teacher and I live b) it had inexpensive entries. The level of competition turned out to be not that challenging for an experienced competitor (so it definitely fits in with newcomer-friendly claims for rising star circuit). I placed 1st in every event I did there, and others from our group said we looked a head above than our competition. Someone also told me that the organizer wasn't too happy that my teacher and his wife decided to bring students, they just wanted them to dance in professional event they had.
I haven't been to any other events listed on Rising star circuit page.