Explanation #1:
It's not "difficult to pull off", as the NFL does it all the time. It requires a pre-assembled, movable stage and pre-wiring and testing of all the sound equipment. With respect to it being done at, say, Super Bowl I can tell you (because I managed the effort on a couple occasions) that pre-game performance takes about a week's worth of practice to really nail down.
So... no. Bon Jovi is not playing before the game on Saturday.
Explanation #2:
@RutgersROB is partially correct. What he didn't say is that Bon Jovi has since been kidnapped by mysterious men in unmarked white vans, loaded onto a plane built entirely of thermite and piloted by space aliens and is being held hostage by Dick Cheney.