Just say "we are having enchiladas for dinner! I found this great recipe for it" and that is that :) Of course that would be my approach and you can even say that you are cutting back a bit on things due to health reasons.
I wasn't a fan of Tofurky. I live with my mom and grandparents and we host thanksgiving every year. No one in my family is overly supportive of my diet (most of them are compassionate people who choose not to know about what is going on and freak out if I try to tell them - they are too afraid to change their habits...but then there are the three people who are aggressive about it and constantly criticize me about it). But every year I make a few dishes that I love and a delicious dessert - I make them overly yummy - and they are gone by the end of the night. Aside from tradition, turkey just doesn't taste good, and compared to my healthy, delicious vegan meals there is no contest!
Hey, Karin!!! Are those rings on your tail?! Very pretty ones, too. ;o) Nice to no there are others out there like me! We had a great Cajun feast tonight- tempeh 'dirty' rice, mixed greens (collard, beet, and radish), and mushrooms with sherry. Can you sing the word "yuuuummmm"?
Some people hold hard and fast to turkey on Thanksgiving and Xmas but generally if they know they're going to be eating at a vegetarian/vegan household they don't (or ar least shouldn't) expect you to cook up a dead bird. You may get grumbles beforehand but when a tasty feast is offered most people won't actually say "that was absolutely delicious but where's the meat?". My mother hosted Thanksgiving a few years ago and her friend offered to bring a turkey for the meat-eaters. However that friend cancelled at the last minute and my mom totally stressed out. Despite everyone saying they could get along just fine without a turkey she bought one anyways and griped the whole time about "the body" in her kitchen. Honestly I think the guests knowing she was upset about serving meat made them much more uncomfortable than if she had just gone with a vegetarian meal. I would stick to just telling people what you're preparing (no need to specify vegan) and if they ask about a turkey politely say you weren't planning on making one. If you're ok with meat in your home you can add that if they don't feel like there will be enough food they're welcome to bring one.
Thanks for all the great suggestions. I don't advertise my change in eating habits, some of my co-workers noticed and asked. But my co-workers are super suportive (I work in a hospital so most of my co-workers are health concious people). I like the idea about just serving food without telling them anything about it. I have not tried the Tofurkey, it might be fun. Part of the fun of going through the change is experimenting with food!