OP here
So, the Dude called his mom last night. MIL has tried many a Brazillian BBQ (not going to attempt spelling) and wanted to share the experience with us. Because I was such an enthusiastic carnivore prior to me getting very sick last year, she assumed the vegetarianism was just a temporary state of affairs. He explained that it wasn't, as every time I experiment with meat, I get an increasingly dramatic result. Except he gave her a rather hilarious and graphic description. I could hear her laughing on the other side of the phone.
She's coming to town on Friday; we're going for sushi. I mentioned to the Dude that I would be happy to try the restaurant on her birthday in a couple of months, but he said, "Why would we purposely pick a place that you'd be left out of the bulk of the experience? No, we'll go somewhere else."
As for my labelling myself as vegetarian, it's just easier to explain than using the term pescatarian. At least in where I live, most people will ask a self-identified veggie about fish. An added personal complication is that I don't care for cooked fish. It's not for health reasons, but the smell and flavour is extremely unpleasant to me; I would happily just have boiled carrots and a side salad if it meant I didn't have to eat fish. However, the way I was raised means that if someone were to put a plate of something I find personally unpleasant in front of me, but it isn't medically prohibited, I will eat it with a smile on my face and thank the cook for an excellent meal.
However, this is how the invitations usually play out:
Friend/Family I haven't seen a while: Come over for dinner!
Spooky: Awesome, we'd love to!
F/F: Any dietary issues or allergies?
Spooky: I had to go vegetarian, but I'm happy to eat side dishes, please no extra effort required!
F/F: What about fish?
Spooky: Shellfish seems okay and raw fish is fine, but I don't really do cooked fish. But really, please don't worry about me, I'm perfectly fine with sides. Can I bring anything?
It seems to work. I really don't want anyone to have to modify their entire meal plan around me. I just thought that since the reason to go out happened to be about me, maybe I could be a little selfish this time. And it did! Yay, eHell!