I believe your answer is correct but you always have to check to be sure certain circumstances can affect the tickets but I believe overall you are correct
It depends if the rain stops and there's only a short delay. If the rain doesn't stop then they'll run the race the following day and your tickets will be honored. This happened to my wife and myself at the Daytona 500, we had to watch the race Monday night instead of Sunday.
Check the web site under FAQ. Don't want to steer you wrong but I know the answer is there.
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