Calculate backwards using this pace calculator https://runsmartproject.com/calculator/
In the added features you’ll find where to put elevation. I’ve used temperature and I trust it. Inputting 4500’ calculates a 9 second/mile effect in a 5K. Calculate and feel it out in your specific race pace training, with the added effect. If you get a few days at the lower elevation prior to the race, test it out with a few 400-600m repeats at the calculated race pace and feel it out.