Other games over NFL history have been relocated due to hurricane damage, snowstorms and an earthquake. Postponements have taken place for the same reasons, as well as venue conflicts or national tragedies (the terrorist attacks on Sept. 11, 2001, and the 1963 assassination of President John F. Kennedy).
There have been playoff games postponed due to weather, most recently last season’s Wild Card matchup between the Steelers and Bills that was rescheduled from Sunday to Monday in Buffalo because of a snowstorm. During the 2016 postseason, the Chiefs-Steelers Divisional game was postponed a day for the same reason.
But to the best of this writer’s knowledge (and after significant research), I believe the upcoming Vikings-Rams contest will mark the first time an NFL playoff game is relocated since 1936. That year, the Green Bay Press-Gazette wrote the following about the NFL Championship Game:
The Green Bay Packers will play the Boston Redskins for the championship of the National Professional Football League at the Polo Grounds, New York, next Sunday afternoon, Coach E. L. Lambeau announced today.
The game has been scheduled for New York instead of Boston because the Redskins have received poor patronage from their hometown fans, and the Packers draw well at the Polo Grounds. All things considered, it is believed that the New York game will produce more revenue, and as most of the money goes directly to the players, a large crowd is desired.
The Packers won the championship 21-6 in front of 29,545.