I think JP would certainly want the public to believe that it can happen on the GP circuit, even if he already knew for certain that the timescale meant it was not possible.
Then he could quietly announce that it had to be switched to the Indy circuit for safety reasons about three weeks in advance and hope it didn't affect ticket sales too much.
Though I wonder how many people will actually go, when there are three other events in Southern England and Wales that day, and all of them are getting live TV coverage.
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