Normally that is the plan. However, Connie just started her port stop at Casa de Campo. If she is scheduled there until late in the evening like her sister Millie, then that evening also will be Smart Casual thus there will only be one Informal night. Keep an eye out on recent reviews.
Informal means a sportcoat or suit for the man (with or without tie) and a nice dress, pants suit or ensemble for the lady. A typical example would be something you might wear to a daytime wedding or out to celebrate a special event. Smart Casual is nice docker style pants and cotton sport shirt or silk T for him and pants suit, sun dress or casual dress for her. This could also include real nice capri outfit. No shorts or jeans in the evening in the dining room.