People worry about the recipes. Recipes are the solved part — you have made most of these before. What actually fails at a large meal is oven contention, a missing ingredient discovered at nine on the morning of, and the fact that one person is holding the entire schedule in their head while being talked to.
Work backwards from the serving time
Take the moment you want to eat and reverse out from it. The oven is the constraint: list what needs it, at what temperature, for how long, and the conflicts become visible days ahead rather than at four in the afternoon. Anything that can be made the day before should be, and the point of doing that is not the time saved — it is oven space.
And write the list from the plan, not from memory
A shopping list assembled by recalling what each dish needs will miss two things reliably: the ingredient used in three dishes where you bought one dish's worth, and the boring staple everyone assumed was in the pantry. Generate the list from the actual recipes and check it against what you already have.
Nobody remembers the food being twenty minutes late. They remember the cook not sitting down.