Airport Empty

I live near one of the busiest general aviation airports (private and corparate jets and props) on the east coast. This is Teterboro Airport in the New York area, about 7 mi. from the city. There are usually many of these private planes here on any weekend, summer and winter. This weekend I passed by there were as of Fri. PM one plane parked there. I have never seen it this vacant.
Is it the upcomming holiday, the presence of the convention next week, or does someone know something going down in the near future?
Keep this in mind if something occurs next week as just another piece of a puzzel.

Was there anything going on this weekend? Any special events? Was the weather exceptionally nice? Remember the end of summer is here and many people may be viewing this as the last chance to get out and fly and enjoy the view.