the national at the black cat

what are the chances this show will sell out?
i have no way to gauge this- i saw them at pitchfork and was unimpressed. i have a friend in town from kansas city and she wants to go.
do the kids like them? I am for once completely stumped.
They played Black Cat earlier in the year, I think. If you could find out if that show sold out, it would be a good indication.

(Sorry, that wasn't much help. I wouldn't say they're hugely popular–"popular" in terms of the type of artists Black Cat hosts–so my guess would be it won't sell out, especially considering it's already so close.)
I don't think the show earlier this year sold out. They're worth seeing for a couple of their more energetic songs, but they can drag with some slower stuff and some of the lyrics are brain-hurtingly dumb.
Nethers are opening, should be a good time.