I am a vegetarian. I usually just skip serving any sort of meat analog stuff, since it's not all that great. (I really, really hate Tofurkey.) There are literally hundreds of things you could serve for this meal which is essentially a harvest celebration. HERE'S this year's suggestions form The Well, with a link to over 600 recipes.
If you feel like you need a main dish, the stuffed pumpkin is big enough to qualify.
I feel that cranberries are essential, I prefer the fresh/raw relish type made with orange juice.
I also serve some sort of dressing/stuffing but, sometimes I do wild rice, sometimes I do blue cornbread with green chiles. If I do the the wild rice one, I sometimes serve stuffed mushrooms as a starter; they are stuffed with a bread-based stuffing with chopped granny smith apples and nuts.