I am a big BBQ fan, so I would do something like a selection of BBQ food (rump steak, pork strips, butterflied chicken breasts, all in different marinades) with some salads and a few easy side dishes. This weekend I cooked BBQ with an Italian Bread Salad, roasted veggies, some room temp boiled new potatoes) and it was a big hit.
But if you don’t BBQ, I would do something simple, I saw a recipe for Chicken breasts stuffed with Boursin wrapped in Parma Ham, and I would serve maybe some easy Dauphinouise Potatoes (I made them a few weeks ago, very easy) and two or three steamed veggies. Keep it simple…
Good luck, let us know what you do!