While I am waiting for a replacemnt I will see how the boat can sail no centerboard in moderate winds (10-20 knots)
Now that I've seen this:PY26 Keel Centerboard Dimensions - The Paceship Website
, I think I can assure you: your boat will still sail fine without the centerboard. If the specs are right, that 75lb board is a tiny fraction of your 2200lbs ballast(according to sailboatdata).
I sail board up a lot - a drop more tender and a little more leeway upwind. Not necessarily a reason to cancel your trip to show grandad the boat, if everything else still checks out.