You can have a lunch reception. But there are requirements and limitations. Alot of limitations. No music until 1 hour after park closes - so you would no be allowed music. However, I am not sure, but you may be allowed 1 musician as long as Epcot approves. They do not want your party to interupt the park guests experience. Depending on the weather, it may be very hot, or humid and unenjoyable for your guests. It is buffet only, and limited food as it may spoil and bugs may be attracted. But you WP can give you a menu. As you probably have read, certain times of the year, WDW gets 'infested' with love bugs. You will not be immune. And you will be watched by guests. I'm thinking of doing it myself, but I am unsure