Bleu, if you HAVE to do dinner for 14, and want to do a Bree/Martha Stewart, shop for this:
Pre-prepared crostini from the shop with a glass of Prosecco perhaps (allow 3 bottles) or choice of juicy fat olives and breadsticks.
Followed by:
Big pasta with the best bottled sauce you can find and the bacon chopped into it along with some chopped onion and extra tomatoes as you said, and pre-grated or shaved parmesan from a packet for people to sprinkle on top.
3-4 large packets of pre-prepared designer salad leaves with bottled dressing.
Pizza express garlic bread
4-6 bottles Chianti
2-3 bottles San Pellegrino mineral water
Bunch of spring flowers on the table
For dessert: Pre-prepared chocolate cake or strawberries, served with clotted cream.
Take you all of 15 minutes to lay out.