If you have received a callback, this is information provided to you to prepare! All of the sides for each role can be found in this post. Please look for the side provided for the role you are being called back for:
https://drive.google.com/drive/folders/1jufF1sveCNTNRY9YbwpX0E5PARnn0EYo?usp=drive_link
These Sides are for "The Wedding Singer"