As far as I have been able to find out it is done at the Garden Grill in Epcot. Your server acts as the minister, Mickey and Minnie act as best man and maid of honor. I booked PS seating towards the end of March and requested this (I am going to suprise my husband). The woman didn't know what I was talking about but said she would note it in the PS. You also get a certificate. I don't think it cost anything additional, just the cost of your meal.