Last year, we made a spiral cut ham, which was pretty easy. With the ham, we served french bread, oven roasted vegetables, salad, and pie. My SIL brought over scalloped potatoes, which went well with the ham.
I agree with the poster above who recommended serving meatballs with the stuffed shells. You could bake the meatballs the day before and then just reheat them in red sauce. Also, look for foods that don't require cooking (salad, store-bought bread) and foods that can be prepared the day before to make the day-of entertaining easier. Personally, I would serve a vegetable platter (veggies cut and dip made the day before) as an appetizer, meatballs in red sauce (prepared the day before), salad, asparagus (microwaved), stuffed shells, chocolate cake (purchased or baked the day before) and cheesecake with berry topping (purchased or made the day before or that morning).
In my opinion, part of the "art of entertaining" is not stressing out. I create my menu to be as low stess yet high value (looks good, tastes good) as possible. Don't be afraid to purchase some foods. (I certainly can't bake bread that tastes as good as bread I can buy for $2 a loaf at the store.)
For a quicker clean up, make sure to empty your dishwasher before/while dinner cooks and ask your guests to please load their own dishes.
Enjoy your party!