Hi!
Sounds like a bit of a stressful situation. I think bringing some safe sides is a great idea. We started over on testing a new food every 4-5 days, so I hear you about limited diets and visiting others. My mom (certified food pusher) is always trying to give him something, and I have to say no that we haven't tested it yet. I am a meatless eater by preference (I don't even have allergies), so people probably thing I am a picky eater anyway, lol. What we do is bring sides that Heath and I can eat and are yummy enough that others will want to try.
You could invite them over next time (if possible and things go well), and it gives them a chance to see what you make/eat. I think it is helpful that it is all of you, rather than just one (like it was when I was the only veggie around). Then people don't feel like they are creating something for one person.
I hope it goes well, and you have a great time!
Jean