What happened on May 1 ?

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 - L-Ewwel ta Mejju, Malta, Jum il-haddiem (Worker's Day).

Festival of Matsu in Taiwan and various locales along the southern coast of China (2005).

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.

May crowning - Unofficial ritual ceremony usually happening in the Roman Catholic Church.

Saint Joseph the Worker (also known as Saint Joseph's Day).

Saint James the Less.

Saint Philip the Apostle.

Saint Andeol.

Saint Brieuc.

Saint Evermaar of Rutten (died 700)

Saint Jeremiah.

Saint Sigismund of Burgundy.

Saint Theodulf.

Saint Augustin Schoeffer

Saint Florine