There will be two Cruise Elegant nights on each 8-day cruise. (Carnival does not have Formal nights.)
The Cruise Elegant Nights will not be the first or last night on the ship, because of luggage issues. They will usually be the first and last Day at Sea.
I would recommend that you make Steakhouse Reservations for the embarkation Day. You get a free bottle of wine in the Steakhouse on that day.
Enjoy your cruise.
I am a Cruisaholic; "I'm Not Dead Yet"
Carnival Inspiration, January 17, 2014 Long Beach, CA *** Carnival Liberty, March 22, 2014, Miami, Florida *** Carnival Miracle, September 10, 2014, Seattle, WA *** Carnival Freedom, March 21, 2015, Fort Lauderdale, FL