If you want to avoid a certain night's menu in the main dining room (let's say it's going to be Croatian night), the staff in Portofino's should be able to tell you what night that's going to happen. When we booked in Chops, they had a list of the "themes" for each night in the dining room. We just picked the night we wanted to avoid, and booked Chops for that night.
Serenade of the Seas b2b January 2016
Serenade of the Seas b2b January 2017