What can be done the day ahead?

I want to get as much of my prep done on Wednesday as possible. I am roasting butternut squash (1 inch cubes tossed with spices and olive oil). Would it be okay if I peeled and cut it up the day before or will it dry out even in a tupperware?
I have seen that you can boil the potatoes for mashed the day before. How do you store them?
Any other thoughts or tips for preparing for the Big Day?

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