The first Monday of September is known as Labor Day in The United States of America.
It is a holiday very similar to May Day, as it honours the achievements of workers. But unlike May Day, which is a tribute to working class only, Labor Day is a tribute to the entire workforce.
Labor Day originated in Toronto in April 1872 with the first workingmen's demonstration organized by the Toronto Trades Assembly. Ten years later, in July, a parade took place in Toronto and Peter J. McGuire of New York was invited to hold a speech. Upon his return to NY he proposed an official celebration to honor workers, and in September 1882 Central Labor Union held its first Labor Day celebration in New York City.
In 1884 first Monday of September officially became Labor Day and over the years it has been celebrated with parades, fireworks and festivals; slowly losing its political connotations and becoming an unofficial end of summer holiday.