If you're referring to the World's Largest Cruise Night (WLCN), the deals probably aren't any different than all the numerous promotions they have throughout the year. The WLCN is just a marketing promotion to stimulate sales. Sort of how the retailers all put the big sale on the day after Thanksgiving to jump start the Christmas season. You can book through TA or direct. I always promote a TA for several reasons. They may or may not have extra amenities with group space. A TA will help you with other aspects of your trip and be a liaison if there are problems. Also when booking through a TA it helps support local economies in the long run.
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