What I would do is call Tavern on the Green and ask prices from the wedding coordinator. You can get a general idea of what it will cost you. Being a New Yorker, I know it will cost you quite a bit.
Be prepared for $150 to $200 a person according to what you pick as entrees, amenities, etc. This wedding could cost in the area of $200K. Good Luck to you. More.
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