From the United States Department of Labor:
LABOR DAY: WHAT IT MEANS
Labor Day, the first Monday in September, is 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.
Naturally our office is closed to celebrate the holiday. We are thankful for all hardworking Americans everywhere and we hope you have a wonderful day!