Before the game, the bars on State Street will be navigable. Not sure there's a designated Husker bar, but State Street Brats is kind of the one that visitors tend to congregate at. After the game, it will be very very very crowded on State St. (Freakfest) - There are bars nearer to the stadium on Regent St. that might be a bit less crowded, but probably still busy.
Thanks! Looking forward to a great time!