Trek, I would invite them back if I remembered who it was. It was at least 2 years ago.
Yesterday, my older son told me that he and his wife are starting some infertility testing. And I thought they just weren't having kids. This is what happens when you don't ask nosy questions. He is only 33 and his wife is 35. I feel really badly for them; not because I want to be a grandparent, but because they would be awesome parents.