"<i>It's Cat, what’s the question?</i>"  .. since you asked 

apparently it was a freshman week concert so your 'average age is 19' tweet makes sense 
- did most of the crowd show up in time for GPN ?
- what was their response to the band ? 
- did some of them seem to be already familiar with GPN ?
- you stopped tweeting the songs so . . full setlist ? 
. . and what was "Slide" ? . . (slide guitar for TINN crossed my mind but ....)
- did you stay for We the Kings ? . . (saw impressive YT #s - do you have to be 19 to get why ?)
- did Grace sit in with them ? 

Rather like your interesting photo choice . . assume it's to show how crowded the stage was . . right ?  

shutting up now