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There's no harm in riding slower, taking longer breaks, etc. if you still finish the event.
Often I'd start a ride with a bit of knee pain and be worried and then after 30km I'd have forgotten about it and be smashing it by the end.
There's also no harm in making adjustments on the fly and judging their impact. Double check measurements beforehand and write stuff down so you can go back to baseline or note what works and then try that again next event.
hippy
Funnily enough I’m in the same boat re knees issue at the moment. Did Amesbury Amble last weekend and that was ok.
Edit - sorry, that was a reply to @ElGonzo