Some nerve... How are they going to tell you that your father can't come, but theirs can... Regardless if your dad wants to go or not, that's flat out disrespectful for them to not allow him.

If it were me I'd tell them to go fvck themselves... It's gotta be a terrible feeling for a father to know that the opposite parents were welcome and you weren't.. I could never do that to my old man

I think the dinner and go idea is great for the parents... After that, its a little weird having them there