May 31: World No Tobacco Day; Feast of the Visitation (Roman Catholicism and Anglicanism)
- 1223 – Mongol invasions: Mongol forces defeated a combined army of Kiev, Galich, and the Cumans at the Kalchik River in present-day Ukraine.
- 1879 – Gilmore's Garden in New York City was renamed Madison Square Garden (pictured), the city's first venue to use that name.
- 1902 – The Second Boer War came to an end with the signing of the Treaty of Vereeniging.
- 1935 – An earthquake of magnitude 7.7 Mw struck Balochistan in the British Raj, now part of Pakistan, killing between 30,000 and 60,000 people.
- 1981 – An organized mob of police and government-sponsored paramilitias began burning the public library in Jaffna, Sri Lanka, destroying over 97,000 items in one of the most violent examples of ethnic biblioclasm of the 20th century.
Albertino Mussato (d. 1329) · Walt Whitman (b. 1819) · Chien-Shiung Wu (b. 1912)
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