"The problem with GnR is that they suck. The songs suck. Even when they were in their prime they sucked. Remnants of an era of misogynistic sunset strip garbage. Bros who dressed like girls but still acted like high school jocks.
If you go to a game at U.S. Cellular, definitely DON'T make it a weekend night (not that it would be if you're doing Pitchfork).
I've been to day games that were fine, and Saturday night games where it feels like literally half the stadium is standing during the action. One of the least observant baseball crowds I've been a part of, and I go to games at Miller Park all the time which has nearly as many hammered bros as Wrigley but half the press.