A nice simple caeser salad to start, get the best fresh ingredients you can, fresh anchovies from the deli (not caned ones) etc.
A baked fish dish for the main. A really good, easy fail safe is;
skinless & boneless cod loin, laid into a ovenproof baking dish, spinkle over sliced avacado, prawns & halved cherry toms, grate chedder over this and drizzle with double cream (not too much). Put it in the oven for about 20-25mins until the fish is firm and cooked through. Serve with jacket potatoes?
Eton Mess for dessert. Fresh berries pureed and mixed into whipped double cream, fold in halved/whole berries and crushed merigues. Serve in wine glasses or short tumblers.
I think the most basic foods and be made to look good through presentation and taste good through good fresh ingredients. Hope these ideas may be of some help and i'm sure your friends will understand a little stress in the kitchen, no-ones immune to that!!!