If you don’t have a parent or friend who can bring you out in a rented car, one option might be to take the train to Baltimore, Philly, or DC, and take Lyft / Uber from there (though it’s still a pretty long drive even from Baltimore, since there’s no direct route across). Note also that getting rideshare _out_ once you’re in Chestertown is not super easy. We’ve done it in the past without renting a car, and it’s really a pain. Or check with the organizers if someone else coming from NYC metro area can help. I think VAHC brings out some of their rental harps (could be wrong here), so maybe they could somehow help if they’re bringing out a truck, but again, coordination would probably be a bit tricky.

There are some shipping services (like uship) that will transport stuff like this, but I don’t think think they’d apply to / be useful to your situation just because I’m not sure if the timing and availability would be precise enough.

My child will be there this summer (though we are very far out of state, so using the rental pool as usual).

You can fit your concert grand harp into a Subaru Outback, if you can rent one or find someone who owns one to help you. Just lay the harp in, with the rear car seats folded down flat, with the discs facing up, and the column will be behind the driver’s seat on the left. The Outback is like a station wagon and makes for easy harp loading and transporting. Ours is a 2024 model and it is great!
Harp Hugs,
Balfour