So...
I had asked my parents to call me when they were getting close to the city so that I could meet them down at Port Authority as soon as their bus got in. Well... "Hi! We just drove through the Lincoln Tunnel. We'll be there in five minutes."
So, after jumping out of bed and scrambling to get ready, I made it down to Port Authority about 30 minutes later. Alas, by that time, they had already made their way over to Radio City Music Hall to pick up their tickets for the Christmas Spectacular. Luckily(?), since they somehow thought that Rockefeller Center was a couple of blocks north of Radio City - instead of right behind it - I was able to catch up with them right by MoMA.