bigfish32, the fireworks dessert party is held in Magic Kingdom at the tomorrowland terrace.
You have to have a reservation and it's not covered on the dining plan so you have to pay OOP for it.
It starts an hour before Wishes fireworks, and they serve all sorts of fancy desserts and some drinks.
Once the fireworks start you have a private viewing area to see the fireworks.
They only let in ppl with ressies, so it's a nice spot to enjoy fireworks and delectable desserts.

It books up fast and we are still waiting for Disney to open up the reservations for the March parties.
They only open up ressies a few weeks in advance.
Ok so I sent an e-mail last night thru the "contact us" link in My Disney experience.
I used the "Dining, Tours, Recreation" topic as my subject.
I politely asked if they were going to have the Wishes Fireworks Dessert Party in March. Told them I was wondering because reservations haven't been opened yet for March and I was hoping to book for my birthday.
I also said that any information regarding March Dessert parties in MK would be greatly appreciated.
I put in all the required info including my resort confirmation #.
I received an e-mail back this morning...
This is what they wrote. LOL
"While we sincerely appreciate your interest, this electronic mail
department does not have access to the Reservations System to check on
availability for the Magic Kingdom® Fireworks Dessert Party Experience.
Please contact our Itinerary Planners at 407-939-3463 so that they make
check on booking reservations for you.
Thank you for contacting the Walt Disney World® Resort, and have a
wonderful birthday!
If you have questions or need further assistance, feel free to contact
us at 407-939-3463."
**On another note I really dislike My disney experience. Some of my dining ressies are still not showing up...even after I linked them seperately. ugh!