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Leaving Las Vegas made its nation-wide release on February 9, 1996, with moderate box office receipts, presumably because the film did not have a big marketing scheme, and it was fairly unknown until after the Academy Awards Ceremony of 1996. The critical success of the film did not surface immediately, however it was one of the most popular films for rental and sale in 1996 and 1997.

It was quite unknown until the Academy Awards Ceremony. That means it became popular after the ceremony. Therefore, don't you think it should be it was fairly unknown until the Academy Awards Ceremony of 1996?
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You could use .. until the , but 'until after the' I think emphasises that the Ceremony was completed before the film became well-known
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Thank you.