Sure this is an obvious one, but so many people do a hack job at the fundamentals of planning. This includes everything from assembling a recipe list to making sure you have enough sea salt (I have seen households run out of salt on Thanksgiving – it is not a pretty thing). I would suggest two weeks before T-Day (yes, you are already late) start assembling a recipe list, finalize it, and then start collecting ingredients before the markets run dry. It happens every year. Someone is always brought to tears as they come to terms with the fact that all of the fennel bulbs are gone, gone, gone. Stock your pantry with non-perishables first, and then (closer to Thanksgiving) secure some of the fresher ingredients.