My cat goes in for surgery tomorrow, which makes tonight possibly her last night on this earth. I want to give her something special for dinner. She loves chicken and poultry in general, and also cheese. I was thinking of just giving her some, finely diced chicken, and some small cheese bits - but are there any other recommendations of something special I could give her?
It would be hard for us to say what is "special" or not. We don't really know your cat. We don't know her likes or dislikes or the kinds of treats or food you normally feed. If you were to be asked the same question for yourself, it would vastly differ from what my answer would be for myself. Probably the best thing to do is to give her the food that she goes bonkers over.
I know for my cat, any time chicken is out on the table, I burn off the dinner calories just trying to keep her away. If what you said above is what she loves, then I am sure she will enjoy it to the max. Maybe even give her a larger portion than usual. Extra treats of her favorite kind.
Let her cuddle up or play with you when it would otherwise annoy you after a day of working. Treat the night to be all about your kitty. Let her feel the love. It isn't so much about getting her special food as much as it is knowing that you prepared her something she loves from your heart and spent quality time to make sure if this were to be her last night, it was memorable for you AND her.
Take lots of pictures, stay up a little later to watch a movie just so she would stay in your lap longer. Enjoy your time together.
It's better not to give something special to your cat before surgery. Even us humans have hospital food for a reason. Stick to it's regular diet in order for her digestive system not to be disturbed and let's hope that she will have many more nights to enjoy special treats described in other answers!
And show her love! That is the most important.