You can use performance institute more than once in one week during the superstar mode and Hall of Fame modes. To use the performance institute more than once in one week (this assumes if your agent lets you use it) first go to your schedule and simulate up to the day that you have your game, then go to the performance institute and do your normal drill. Now go to your schedule and start your game, but when you get to the kickoff, quit and go back to the performance institute and you should be able to attend once more (before the game).