I'm sure it's not a universal rule, but for obvious reasons, I don't know of any marinas in Narragansett Bay that permit docking under sail . . . at least ones with "very expensive boats around".
There was a young French, transient sailor at our marina for a couple weeks a while back, without power. He would always come in solo and dock in and out of his narrow slip under sail. For some reason, management was oblivious to this - as far as I knew. Truely amazing helmsman skills, and no damage was ever done to adjacent boats.
True Blue . . .
sold the Nauticat