Though it's not the official end of the summer (the Autumnal Equinox is on September 22), Labor Day has traditionally meant the start of school (if you lived in more Northern states) and the early fall shopping sales. Various government services are closed today, as are banks. Gothamist will be publishing on a lighter schedule today, but we'll see you tomorrow with more.
And the U.S. Department of Labor on the history of Labor Day: "...a creation of the labor movement and is dedicated to the social and economic achievements of American workers. It constitutes a yearly national tribute to the contributions workers have made to the strength, prosperity, and well-being of our country."