If you find yourself short on nutmeg or minus a few potatoes, there is a good chance a grocery store near you will be open on Thanksgiving for at least for part of the day.
Here is a list of Thanksgiving Day openings, closings and store hours for national grocery store chains. Reminder: Some stores do not follow national opening/closing hours. Some state laws prohibit stores being open on a holiday. Be sure to check with your local stores for times.