How many sea days do you have? How long is the cruise? We had three formal and one informal on our 12 days cruise in the Med. The 1st formal was the first sea day, the last formal was the last sea day, the 3rd was in the middle on a sea day and the informal (like you said, barely any difference except the men didn't wear tuxes) was in the middle of the 2nd and 3rd formal nights, also on a sea day. Our port days were long, many times the ship didn't sail until close to midnight. We left port before 8:30 once that I remember... out of Toarmina, Sicily. The Captain took the ship out around Capri so that we could see it.