* May Day, Labour Day, Workers' Day, Day of the International Solidarity of Workers.
* Italy - national holiday (Giorno dei Lavoratori).
* Switzerland - official feast of Spring.
* Czech Republic - "National Love Day" ? couples tend to flock to the memorial of the poet Karel Hynek Mácha in Prague and kiss.
* Lei Day - Hawaiian holiday for the Lei.
* Beltane, Lá Bealtaine, the first day of Summer in modern Ireland was celebrated by the Celts, and is now also celebrated by Neopagans and Wiccans.
* Northern Europe - Walpurgis Night.
* Roman Empire - all-female festival in honour of Bona Dea.
* Roman Empire - fourth and last day of the Floralia in honour of Flora.
* United States - Law Day, U.S.A., Loyalty Day.
* Malta - public holiday (L-Ewwel ta' Mejju (1st May Day), or Jum il-Haddiem (Worker's Day)).
* Maharashtra Divas (Maharashtra Day) in the state of Maharastra, India. On May 1, 1960, Maharashtra came into existence when Bombay State was split into the new linguistic states of Maharashtra and Gujarat.
* Gujarat Divas (Gujarat Day) in the state of Gujarat, India. On May 1, 1960, Gujarat came into existence when Bombay State was split into the new linguistic states of Maharashtra and Gujarat.