What's the problem with the sign up? Just go to http://www.rubikscubing.com/armonkspring08/registration.html and click all of your events and give times. Are you getting an error or something? If there's something confusing I'll definitely fix it.
I'm going not that I have much choice given that I'm organizing it. And Paiev, you don't need to come both days if you're not competing both days. Each event happens on only one day, none span over both.