I sprained my ankle 2 weeks before a tri - after 3 days on crutches (no weight bearing) then gradually getting back into it was fine.
Rode my bike after a week, ran after 10days, did a tri 2weeks +1day later.
All is not lost ! Just be sensible - follow the advice above (got similar from my physio sis-in-law) give it some rest, if it hurts when you run stop.
Have a great time in NY !
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