Constitution Day is a holiday to honor the constitution of a country. Constitution Day is often celebrated on the anniversary of the signing, promulgation or adoption of the constitution, or in some cases, to commemorate the change to constitutional monarchy:

Workers' Day is a public holiday in at least the following countries : Angola, Bulgaria, China (where it is celebrated as International Labour Day and is a 3 day holiday), Cuba, Namibia, Malta, Marshal Islands, Mozambique, Panama, Zambia and Zimbabwe. Its history is closely linked to the labour movement and the May Day celebrations celebrated in other parts of the world.

Workers' Day is a national public holiday in South Africa and since 1994, it has been celebrated on 1 May of each year. It has its origins within the historical struggles of workers and their trade unions internationally for solidarity between working people in their struggles to win fair employment standards and more importantly, to establish a culture of human and worker rights and to ensure that these are enshrined in international law and the national law of those countries aligned to the International Labour Organisation. In pre-1994 South Africa, the demand for the annual observance of the day as a public holiday became a rallying point for workers and their trade unions and was one of a number of annually significant days to symbolise and mobilise resistance to the Apartheid government and its racial policies.

Labour Day or Labor Day is an annual holiday to celebrate the economic and social achievements of workers. Labour Day has its origins in the labour union movement, specifically the eight-hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.

Celebrating the Australian labour movement, the Labour Day public holiday is fixed by the various state and territory governments, and so varies considerably. It is the first Monday in October in the Australian Capital Territory, New South Wales and South Australia. In both Victoria and Tasmania, it is the second Monday in March (though the latter calls it Eight Hours Day). In Western Australia, Labour Day is the first Monday in March. In both Queensland and the Northern Territory, it is the first Monday in May.

Labour Day or Labor Day is an annual holiday to celebrate the economic and social achievements of workers. Labour Day has its origins in the labour union movement, specifically the eight-hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.

Celebrating the Australian labour movement, the Labour Day public holiday is fixed by the various state and territory governments, and so varies considerably. It is the first Monday in October in the Australian Capital Territory, New South Wales and South Australia. In both Victoria and Tasmania, it is the second Monday in March (though the latter calls it Eight Hours Day). In Western Australia, Labour Day is the first Monday in March. In both Queensland and the Northern Territory, it is the first Monday in May.

May Day on May 1 is an ancient northern hemisphere spring festival and usually a public holiday;^[1] it is also a traditional spring holiday in many cultures.

May Day is related to the Celtic festival of Beltane and the Germanic festival of Walpurgis Night. May Day falls exactly half a year from November 1, another cross-quarter day which is also associated with various northern European pagan and neopagan festivals such as Samhain. May Day marks the end of the unfarmable winter half of the year in the Northern hemisphere, and it has traditionally been an occasion for popular and often raucous celebrations. As Europe became Christianized the pagan holidays lost their religious character and either changed into popular secular celebrations, as with May Day, or were merged with or replaced by new Christian holidays as with Christmas, Easter, Pentecost and All Saint's Day. In the twentieth century, many neopagans began reconstructing the old traditions and celebrating May Day as a pagan religious festival again.