Try the internet tomorrow when it goes live. Also keep checking back. I'm sure there will be cancelations. Walk ups would probably be few but if you show up at the start of dinner (or during the fireworks) and have a small party you might get lucky. However if you are over 4 people there really isn't a hope for walk up at most restaurants.
I figured trying right at the start of dinner service might be my best bet. Do they really ADR the whole place? Wow. We are a party of three so there might be a shot.