Boston to Gorham / Mt Washington valley before Hillclimb - carpool / other recs?

Hi all, I'm visiting from the left coast next week for the MW Hillclimb. My friend was going to join and drive us down to Gorham but had to drop out. I don't drive so am curious if anyone would be open to carpooling down there the Thursday or Friday before the event (happy to defray gas, toll costs etc!) or have any other ideas? It looks like Concord coach may accept bikes but does not guarantee it. If all else fails I can Amtrak to Portland and ride in from there but it's a bit of a slog with a backpack and all.

TIA! Cheers

• Jackson