For quite a few people, Labor Day implies two things: a day off from work and the end of summer. so what exactly is Labor Day? Labours’ Day is mainly celebrated to pay tribute to working men and women. Therefore, May 1 is a national public holiday in more than 80 countries, but in only some of those countries is the public holiday officially known as Labor Day or some similar variant. In the other countries, the public holiday marks the Spring festival of May Day.