I often wonder what significant anniversaries are due at some point in the future as some of them might be of interest as triggers for blog posts or visits somewhere. However, it is often difficult to find out quickly what events have significant anniversaries - hence this section on the website.
By "significant anniversaries", I mean dates that are not, for example, the 73rd anniversary of something, but the 50th, 100th, 200th etc.
It should help to flag up interesting events.
Significant anniversaries during May 2021
| Anniversary | Details |
| 5th | The Labour MP Sadiq Khan is sworn in as mayor of London, succeeding Boris Johnson and becoming London's first Muslim mayor. (7th May 2016) |
| 5th | For the first time, Leicester City win the Premier League. (2nd May 2016) |
| 10th | The Royal Navy ended its training role in Iraq, concluding the British military Operation Telic there. (22nd May 2011) |
| 10th | Queen Elizabeth II made a state visit to the Republic of Ireland, the first by a reigning monarch of the United Kingdom to Dublin since 1911. (20th May 2011) |
| 20th | Medication prices fall as a result of a court ruling which puts an end to the drug industry's price-fixing policies. (15th May 2001) |
| 20th | House of Commons (Removal of Clergy Disqualification) Act 2001 removes disqualifications for clergy in standing for election as Members of Parliament and other elected bodies. (11th May 2001) |
| 60th | Peter Benenson's article The Forgotten Prisoners is published in several internationally read newspapers. This will later be thought of as the founding of the human rights organization Amnesty International. (28th May 1961) |
| 70th | British radio comedy programme The Goon Show was broadcast on BBC for the first time. (28th May 1951) |
| 70th | London's Royal Festival Hall opens with the Festival of Britain (3rd May 1951) |
| 80th | World War II: The House of Commons in London is damaged by the Luftwaffe in an air raid. (10th May 1941) |
| 80th | World War II: Rudolf Hess parachutes into Scotland to try to negotiate a peace deal between the United Kingdom and Nazi Germany. (10th May 1941) |
| 80th | Following the coup d'état against Iraq Crown Prince 'Abd al-Ilah earlier that year, the United Kingdom launches the Anglo-Iraqi War to restore him to power. (2nd May 1941) |
| 225th | Edward Jenner administers the first smallpox vaccination. (14th May 1796) |
| 350th | Thomas Blood, disguised as a clergyman, attempts to steal England's Crown Jewels from the Tower of London. (9th May 1671) |
| 500th | Edward Stafford, 3rd Duke of Buckingham, is executed for treason. (17th May 1521) |
| 550th | Wars of the Roses: The Battle of Tewkesbury: Edward IV defeats a Lancastrian Army and kills Edward, Prince of Wales. (4th May 1471) |
Alternatively, see all anniversaries for this month.
Or... select a different date below:
