Spring Game Questions..

How exactly does the spring game work? I've never been and was wondering if I could get some information. There are no tickets that need to be purchased, correct? I can just show up at 8am and go on the locker room tour and watch the flag football game as well as the spring game? And I can leave and re-enter the stadium as I please? Does anyone have any tips for a first-timer? I'm really excited and want to get the most out of the experience. I'm bringing the girlfriend, too. If she wants to be in a relationship with me, she'll have to be in a relationship with Michigan Football. Thanks for any information you guys can give me, I appreciate it :)