MMB Rehearsal (for Season Ticket Holders) Question

I think the Michigan Marching Band had an open (for season ticket holders) rehearsal the night before the App St game and they are doing it again tomorrow night in the Stadium at 7pm.  Before I schlep my family over to check it out, I'm wondering if anyone went to the first one.  If so, was it well attended?  Is close parking available?  Lots of kids?  Recommended to attend?

Any feedback would be much appreciated. Thanks.