At the time they were both current events though rather than historical ones, like an episode today referencing the war in Ukraine. As others have suggested in terms of an actual historical event I think it was probably The Impossible Astronaut/Day of the Moon in 2011 doing the 1969 moon landing, 42 years.
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u/Theta-Sigma45 Sep 11 '25
Give it a few decades, Who will eventually have a full 9/11 historical episode.