Starters: I like all sorts of salads. I also like soups; souffles (the twice baked sort which you can cook ahead then reheat)or canapes.
Main: If meat, then a casserole, which can be cooked ahead and reheated (and "tarted up" before serving, e.g. with croutons/cobbler)
Also got lots of ideas for prepare ahead/cook quickly ideas, but need you to narrow down the menu choices
Dessert: Something fruity: grilled pineapple; the Mumsnet must-have "lemon drizzle cake" with some sort of fruity thing on side.....
Have a think about the "shape" of the menu you want to serve. and alternatives you are thinking for serving for each course (e.g. "salad or canapes for starters; definitely no soup" followed by "something with chicken breasts, no red meat or casseroles" etc etc would make it easier ot help you....