It could be useful if there was a tickbox you could check after editing a setlist to precise if the setlist you added is the right one or if there could be some mistakes.

That would be something like this.

Complete setlist ? Yes or No
Right order ? Yes or No
How sure are you ? 100% sure / 90%...

And incomplete setlists would appear with when you browse the shows, for exemple :

Foals at Heaven, London, England INCOMPLETE (in small and red letters :P)

We gotta have it. I'm kind of bored to have to write an info at the bottom saying it's incomplete.