It would be helpful to know what you have in mind so people don't waste time suggesting what you've already thought of.
That said, Grand Prix New York Racing should be on your list
if the Mitzvah is for your son and his friends. Check their website
Grand Prix New York (http://www.gpny.com/launch08/index.php - broken link) . The Saw Mill club also does large events.
If it's for you and your friends there are dozens of high end catering places (Kittlehouse, Le Chateau, etc etc).
Full Disclosure: I have no affiliation or interest in Grand Prix.