Here's some additional information from the NCL FAQ section of this website:
Dining Terms and Conditions
Specialty Dining Packages (SDP) are available online for pre-sale or onboard during the first two days of the voyage. SDP is not available on 1 and 2-day sailings; On 3-day sailings SDP is for sale on day 1 only. No refunds available if not all meals are used. SDPs are personal and non-transferable. SDP does not include any beverages and additional main courses will incur charges. An SDP meal in Food Republic, Pincho, Sushi and Wasabi includes 4 menu items. A 20% gratuity and specialty service charge will be added to the package price. No SDP kids pricing available. We encourage guests to visit ncl.com/myncl to make dining reservations in advance. Reservations are not required but highly recommended for SDP guests, however, once onboard, reservations will be subject to availability. SDP meals can be enjoyed at American Diner, Cagney's Steakhouse, Food Republic, Italian, Le Bistro, Los Lobos, Margaritaville at Sea, Moderno Churrascaria, Ocean Blue and Bayamo by Ocean Blue, Pincho Tapas Bar, Q Texas Smokehouse, Raw Bar, Sushi and Teppanyaki. Dining options vary by ship. You may choose to use SDP meals in entertainment-based restaurants for an upcharge. SDP guests will be charged the following upcharges versus the full cover charge/a la carte price: Cirque Dreams (Epic, Getaway) - $10, Supper Club Cabaret (Escape) - $18, Velvet (Breakaway) - $10. When using the upcharge option, that meal will be deducted from the SDP. Venues/Events not included in SDP include: Room Service, Mini Bar, District Brewhouse, The Bake Shop, Coco's, O' Sheehan's Ice Cream Bar, Gelato, Special Occasion/Holiday menus (e.g. New Year's Eve, Christmas), Jazz Brunch, Wine Lovers and Murder Mystery lunches.
Date published: 2019-07-20