Thanksgiving evening in Manhattan or Brooklyn- Vegetarian or Seafood?

[CGeats]

Looking to do a special night out in Manhattan or Brooklyn on Thanksgiving night. Must be vegetarian or seafood based. Pre fixe is probably the way to go, but vege or fish. Vegan OK. Chinatown OK too but it better be -royal-. I realize it's short warning for reservations but looking for ideas...

Thanks!