On September 5, 1882, some 10,000 workers assembled in New York City to participate in America's first Labor Day parade. After marching from City Hall, past reviewing stands in Union Square, and then uptown to 42nd Street, the workers and their families gathered in Wendel's Elm Park for a picnic, concert, and speeches. (source)
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.