Pre show music???

Hello! On July 10th, I was at the Panic! X Weezer concert at the Hollywood Casino Amphithetre and before the show they played a playlist of a few songs(one of which included Irresistible by Fall Out Boy) that they played on a loop before the concert. I heard this one song that I REALLY REALLY REALLY liked and I have no idea what it was. I already searched Google and even asked live nation themselves! No one knows the playlist. Does anyone have a clue to where I could find this illusion playlist(and long lost mystery song)?????? Please it would be a great help to me!
Thank you!