Depending on numbers (and this coming weekend I have 27) I cooked one large ham [updated 16 Dec 2013], two legs of lamb and bought a whole round of brie (carve out one triangle and pull it out slightly; add some dried apricots chopped in half to help set it off).
Place each of these on their own carving boards (lamb legs one at a time) on your kitchen table next to a pile of side plates, another pile of serviettes, plenty of the appropriate condiments/sauces, and a big bowl of sliced baguette (plus butter).
Simple, easy to scavenge from (depending on your level of hunger) and minimal washing up.