Frozen whole turkey takes about 4 days to thaw in the refrigerator so for us that is probably the item that requires the most advance planning. Other than deciding on quantity/size of side dishes based on how many will be in attendance, there really isn't anything on our menu that requires weeks of planning.
Tried making it with roasted pie pumpkins a few years ago and no one could tell it tasted any different. Most of the flavor of pumpkin pie is from the added spice blend. It is a LOT more work to roast a pumpkin for a result that made no difference, so we are back to using canned pumpkin.
Pumpkin pie (I make it with fresh pumpkin, but I'm not sure I'll find the pie pumpkins down here).
Tried making it with roasted pie pumpkins a few years ago and no one could tell it tasted any different. Most of the flavor of pumpkin pie is from the added spice blend. It is a LOT more work to roast a pumpkin for a result that made no difference, so we are back to using canned pumpkin.