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And they'll probably have to refund you and then you'll pay full price while waiting for the refund. At least that's been my experience the two times I've done it in the past. But I was able to change regular park tickets recently and just had to pay the difference.
So, does this means crowds this year could be just slightly less?
https://www.reuters.com/world/us/exclusive-us-will-not-lift-travel-restrictions-citing-delta-variant-official-2021-07-26/