Here's info about the private dining:
Grand Floridian Private Dinner
The Grand Floridian will create a private dining experience for couples, with views of the fireworks and a personal butler to attend to all your needs.
The dinners usually take place outside in the alcove area overlooking the Seven Seas Lagoon, and dessert is timed to coincide with the Wishes fireworks at Magic Kingdom. You can order off of the private dining menu, or for a 25% surcharge, order from any of the Grand Floridian's fantastic restaurants (Narcoossees, Citricos, etc.).
This standard Private Dining meal includes a multi-course dinner and one bottle of wine or champagne. Depending on your specific food and beverage selections, the dinner usually costs around $200 plus 6.5% tax and gratuity.
Contact (407) 824-2578 at least seven days in advance to schedule a private dinner at the Grand Floridian.