For a fee, you can book yourself an Illuminations Dessert Party at WDW. You go through either Disneys Meetings or Disney's Event Services departments for that. (If you are having a custom Fairy Tale Wedding, your wedding coordinator can handle that for you.) I should mention that there are minimum fees for an event like this. Amongst other things, you get to select what dessert & drink packages to offer your guests during your private party. There are a few waterfront locations at Epcot that may be used for an Illuminations Dessert Party: Italy, France, UK, to name just a few.