It will be a casual thing, but a proper meal is needed.
I was thinking a fish pie and then some steamed veg, plus another dish that could be served with the steamed veg, but not cottage pie andprobably not a stew/casserole type thing, but I can't think of anything?
How about a big savoury tart? Goats cheese and caramelised red onion is a great combination, or roasted veg + parma ham....lots of possibilities. You could buy the pastry base ready made and just do the filling yourself.