Personally, I wouldn't want to be awake for it. When it comes to surgery, ignorance is bliss, in my opinion. Since it's not for another 6 weeks, can you tell them that you would rather be asleep for it?
I had a stoma taken down once and had to be on a liquid diet at first, then cream soups, then soft food, and slowly work my way up to a normal diet. So, I'm thinking you will not be able to a Thanksgiving dinner so soon after surgery. Your mom could always cook you a nice turkey dinner with all the fixin's once you're able to pig out again!