How to celebrate Labor Day was actually laid out in the original proposal for the holiday: a parade to show “the strength and espirit de corps of the trade and labor organizations,” followed by a party for workers and their families. (2) In 1898, Samuel Gompers, head of the American Federation of Labor, called it "the day for which the toilers in past centuries looked forward, when their rights and their wrongs would be discussed...that the workers of our day may not only lay down their tools of labor for a holiday, but upon which they may touch shoulders in marching phalanx and feel the stronger for it."
1) Origins of Labor Day. pbs.org
2) The History of Labor Day. US Department of Labor.