What are the necesary dishes to make it thanksgiving dinner-?

The answer for this is based on perspective. While mine is that you can eat any food you wish on Thanksgiving and it would still be Thanksgiving. If you wanted a traditional Thanksgiving that was closer to what the pilgrims had on their first Thanksgiving celebration, it wouldn't even closely resemble the foods now chosen as a national holiday staple. The source below states what was most probably on the food table for the pilgrims in the origin of the Holiday, as well as surprising things which were not. In my own opinion, you can cook everything in an American Thanksgiving - the turkey, and corn on the cob, gravy, mashed potatoes - you name it, but it's just 'not' Thanksgiving without cranberry sauce and pumpkin pie. Regardless of that, food doesn't make the holiday, the people celebrating it do.

Don't get caught up in what should be necessary dishes. It all depends on your culture, regions of the country and personal preferences. Life is too shot to haggle about such things.

Turkey only if you like it.. mashed potatoes,sweet potatoes,fresh green beans,stuffing...Make sure everyone can eat pork if you are stuffing with sausage. I always make plain stuffing in bird and sausage stuffing in another baking dish. Fresh cranberries,various pies and or pastries. TY Rose