I have a friend whose house I go over to occasionally (yes, just one) and I used to stay for dinner pretty much every time I went there. After I went veg, though, I pretty much avoided eating at people's houses. So one day he calls me up and asks if I can come over and then asks, "uh, can you stay for dinner this time? my dad's dying to have an excuse to make a vegan meal."
so I did, and lo and behold, his dad served up a lovely vegan meal. He even did research before he went shopping to look for "hidden ingredients" just to make sure it was all kosher. er... all vegan.