I'm going to go out on a limb and make some assumptions. The problem Saturday was that they did not follow normal "game day" parking procedures. Had they done that, there would not have been a problem. I'll assume they didn't do that for a couple reasons. One, because they miscalculated the attendance impact and thought they didn't need to. Or two, because they couldn't get enough people to staff for parking attendants, which is an unfortunate reality. Afterall, there were probably about half the cars vs normal game day.
For normal "game day" events, I think they need to look first at how to get local residents to/from their homes before and after games using as few roads as possible and keep those roads open to local traffic. Then, make every effort to close everything else to get gameday traffic in and out. If they planned it out well, I'm sure they could do it.
I see two MAJOR bottlenecks (I'm sure there are more, I know). Park Ave before and after the game and each parking lot after the game. They need more entrances and exits to lots both before and after. That gets people in and out of the lots faster and off Park more quickly.
They should also think about limited use exit ramps (is that possible?) between 99 and Fox Hollow. It's .8 miles from the corner of Park and Fox Hollow at the NE corner of the stadium to the I99 underpass. Empty the lots more quickly right to I99.