Crystal has "themes" on many of its cruises. The food and wine theme generally means a noted chef and a wine expert will be on board for a series of cooking demonstrations and wine tastings -- free of charge, of course.
Crystal in the evening is a more dressy line. On an average 12 day cruise there are 3 formal nights, 3 informal nights, and 6 casual nights. 90% of the men wear tuxes on formal nights with the women wearing either long or short gowns or dressy pant suits. After 6 p.m. in the public areas of the ship, everyone must conform to that night's dress code. For informal nights, a jacket and slacks are required for men but ties are optional. Women wear nice dresses or pant suits. Casual is "country club casual" -- for men, slacks and sport shirts are generally worn and women wear sporty pant suits.
Have you selected a cruise as yet?