re: When did Superbowl parties become a thing?

quote:

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This has been the case for 34 years, the last kickoff before 6pm EST was 1991.

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Not sure where you got your data from, but it was NOT the case in the 1990s. Here are kickoff times in the time zones they were played in during that decade:

Super Bowl XXIV (1990, Louisiana Superdome) — 3:05 PM CST
Super Bowl XXV (1991, Tampa Stadium) — 3:00 PM EST
Super Bowl XXVI (1992, Metrodome, Minneapolis) — 3:00 PM CST
Super Bowl XXVII (1993, Rose Bowl, Pasadena) — 1:30 PM PST
Super Bowl XXVIII (1994, Georgia Dome, Atlanta) — 3:30 PM EST
Super Bowl XXIX (1995, Joe Robbie Stadium, Miami) — 5:00 PM EST
Super Bowl XXX (1996, Sun Devil Stadium, Tempe) — 3:00 PM MST
Super Bowl XXXI (1997, Louisiana Superdome) — 2:35 PM CST
Super Bowl XXXII (1998, Qualcomm Stadium, San Diego) — 3:35 PM PST
Super Bowl XXXIII (1999, Pro Player Stadium, Miami Gardens) — 4:05 PM EST
Super Bowl XXXIV (2000, Georgia Dome, Atlanta) — 3:30 PM EST