No one knows for sure, but when this is offered as part of a special package or event, unless it's something like the Illuminations Dessert Party, what they do is rope off areas of the WS and allow access only to people with tickets or wristbands or whatever. There likely won't be seating unless there were already benches in the area, and those will be taken by the earliest arrivals. It'll just be an area to stand that might have a more desirable view that you don't have to stake out an hour ahead of time.