an Entity references as follows:
In Singapore, May Day (or Labour Day) is celebrated on 1 May each year as a mark of solidarity amongst workers. The celebration of May Day as a public holiday began only in 1960 after the People's Action Party came into power. Before then, only workers defined as such under the Labour Ordinance 1955 and those defined as industrial clerks under the Clerks Employment Ordinance 1957 were given paid holidays.