International Workers' Day or Labour Day (International), and its related observances: Loyalty Day, formerly intended to counterbalance the celebration of Labour Day. (United States)

Loyalty Day is observed on May 1 in the United States, though not widely celebrated. It was proclaimed by President Dwight D. Eisenhower as a day for declaring loyalty to the United States of America and to acknowledge American history.

Labour Day is an annual day of celebration of the labour movement and its achievements. It 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.