I have not experienced what your going through so I cannot give you knowledgeable advice and would not dare tell you what you should do.
However I can tell you what I think I would do. I could not do it. My wife is the sun and the moon to me. My heart sings when I see her. I would not be strong enough to endure that pain. The divorce is moving forward, the lawyer wants your dog so how is this dinner going to end well.
If my wife divorces me I will never see her again except at my children's weddings.
PigPen I don't know what the right answer is for you but if she wants you back she doesn't need to cook you dinner to tell you.