We did that last year, in the rain - it was very crowded but it worked in a pinch.
Examples of places I have in mind.. for inside congregation (not for food or drink).... Grand Californian Lobby, waiting area at Goofy's Kitchen (can be inside or outside), Animation Studios... ???
Outside -- Riverbelle Terrace, New Orleans Square, the food court at DCA, the creole restaurant terrace at DTD, the bakery seating area at DTD close to the main gates.... ???
Special food places -- Blue Bayou, Avalon Cove, Storybook Cafe, Goofy's Kitchen, Riverbelle Terrace, Plaza Inn... ???