If you are staying at a Disney resort you can call CRO (DRC) and have it added to your resort reservation. You can also call the dining reservations line and have it added to your dining ADRs. Be sure to get anniversary and birthday buttons when you arrive and wear them. You will get plenty of acknowledgements from castmembers. Remind them at the restaurants and you might get special recognition (e.g. celebratory cupcake or dessert, confetti, champagne, card). It will depend upon the server and restaurant so while you might get something special, there might be absolutely not recognition at all.
If you are not staying at a Disney resort you can get the buttons in the park at Guest Relations.