[BostonCard]

The logical thing would be to try to pair Pac-12 North teams with each other and Pac-12 South teams with each other.  So, you might have rivalry week the week before Thanksgiving and then the following Thanksgiving matchups in the North:

Washington-Oregon
Oregon-Cal
Washington St-Stanford

And in the South:
UCLA - Utah
Colorado - Arizona
ASU - USC

The problem, of course, is Notre Dame, who plays Stanford on odd years and USC on even years.  This forces the conference to leave one team unpaired each year, so that team will either have a bye (Arizona this year) or finding an out of conference opponent (Cal played BYU last year).  One could have an annual game against BYU (or another independent) that rotates for those teams not playing Notre Dame.  In this case, when Stanford plays ND, Washington State would play BYU, and if USC played Notre Dame, then ASU would play BYU.

The key is this set-up avoids 1) Rivalry games during Thanksgiving week end, 2) a North-South matchup the last week of the season that would be re-played the next week.  It also maximizes the chances that a head-to-head matchup between the leading teams in a division will happen in the last two weeks of the year; imagine if Stanford - Oregon were being played this week.

BC

[BostonCard]

The logical thing would be to try to pair Pac-12 North teams with each other and Pac-12 South teams with each other.  So, you might have rivalry week the week before Thanksgiving and then the following Thanksgiving matchups in the North:

Washington-Oregon
Oregon-Cal
Washington St-Stanford

And in the South:
UCLA - Utah
Colorado - Arizona
ASU - USC

The problem, of course, is Notre Dame, who plays Stanford on odd years and USC on even years.  This forces the conference to leave one team unpaired each year, so that team will either have a bye (Arizona this year) or finding an out of conference opponent (Cal played BYU last year).  One could have an annual game against BYU (or another independent) that rotates for those teams not playing Notre Dame.  In this case, when Stanford plays ND, Washington State would play BYU, and if USC played Notre Dame, then ASU would play BYU.

The key is this set-up avoids 1) Rivalry games during Thanksgiving week end, 2) a North-South matchup the last week of the season that would be re-played the next week.  It also maximizes the chances that a head-to-head matchup between the leading teams in a division will happen in the last two weeks of the year; imagine if Stanford - Oregon were being played this week.

BC