I do not think this is necessarily incomplete.
This was the H.O.R.D.E. festival, 1st year i believe.
I was at this show, and I remember specifically that ARU segued directly into Widespread Panic.
That is to say, Widespread's members came & plugged in one by one, as ARU continued jamming. One by one, ARU members unplugged & left the stage. The music was a seamless, driving jam, one band right into the other. One of the coolest things I've seen.

I do not remember who was before the ARU, if anyone. I believe I arrived during their set. If there's a cut-in at the start as well though, it may have resulted from a similar segue with an opening band?