I have done some private chef stuff, and my brother had some great gigs in Newport, including one of the mansions. He did lots of parties. But funny thing was when he cooked for family they would mostly request fries chicken. One great perk was after my brother worked thanksgivings, he would show up late at my place with several great bottles of wine
As far as your question, I would find out some of the better restaurants and caterers in area. Ideally I would sample menus, find who's style I liked, and inquire about their services or recomendation