The Black Friday game for Nebraska actually predates 'N v CU'. Nebraska and OU did the Black Friday thing from 1990-95, and once the XII schedule interfered with annual N v OU tilts, CU became the Black Friday opponent.
Nebraska played OU 5 times on Thanksgiving Day (including the '71 GOTC), the balance of their regular season games were in Mid-late November between '50s-'89, save the biggest upset in the series, the '59 game when Nebraska broke OU's zillion game conference winning streak on Halloween.
It'd be nice to see Nebraska retain the game slot, with Iowa (preferred), but all of these ships have sailed at this point.