I was divorce lawyer for 40 years before retirement. My advice to the newly divorced man who is going through a family holiday.....treat Thanksgiving just like another day. Go to a movie, preferably during the time you would normally eat. Stay away from the alcohol because it increases the "Poor Me" feelings. Call your family or friends tonight. Stay off the pity pot.
Whatever else you decide to do, if divorce is still ongoing and not finalized......do NOT contact her by phone. Anything you say or do can be used against you and my experience is that if your soon to be ex can use more ammunition to bring you down....she will. Good luck and don't try to go through a divorce without a lawyer on your side.