I *think* that they are only taking reservations for "lunch" - like, 11am-4pm. And then walk-ups in the evening.
I had to use the reservation finder to even snag lunch reservations - they are hard to find!
Last week, I walked right past The Plaza and thought later that I should have stopped and asked what's going on with their reservations so I don't kill myself trying to score a dinner one if they don't exist right now. I'll be back in the park in 2 weeks and will have to remember to just ask on my way by. If they are only walk-ups at night, I'm curious what the average wait is...