We have definitely done groups of 20+ people at the same table at 'Ohana. It's a lot of fun there. We have also done Boma at a single table and Portobello (Disney Springs). Some places we've had to divide in half, but sat close, including Sanaa (if you are willing to do first seating), Rainforest, Teppan Edo, Nine Dragons, and there's probably another one in there I'm forgetting. But if you plan it in advance and call (as suggested above), you can usually make it happen.