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 December 2021
| Anniversary | Details |
| 5th | A riot occurs at HMP Birmingham, described as the worst since the Strangeways prison riot and protest of 1990. Authorities regain control of all four wings after more than 12 hours of disorder involving 600 inmates. (16th Dec 2016) |
| 5th | HMS Illustrious, the last Invincible-class aircraft carrier, makes its final voyage out of Portsmouth Harbour to a ship recycling company in Turkey. (7th Dec 2016) |
| 10th | 2011 was the second warmest year on record for the UK, according to the Met Office. Only 2006, with an average temperature of 9.73C (49.5F), was warmer than 2011's average temperature of 9.62C (49.3F). (30th Dec 2011) |
| 20th | British-born terrorist, Richard Reid, attempts to blow up American Airlines Flight 63 from Charles de Gaulle Airport in Paris to Miami International Airport, using explosives hidden in his shoes. (22nd Dec 2001) |
| 20th | Timothy Hunt and Paul Nurse win the Nobel Prize in Physiology or Medicine jointly with Leland H. Hartwell "for their discoveries of key regulators of the cell cycle". (10th Dec 2001) |
| 50th | McGurk's Bar bombing: An Ulster Volunteer Force bomb kills 15 civilians and wounds 17 in Belfast, Northern Ireland. (4th Dec 1971) |
| 50th | Fifteen people are killed and seventeen others injured in a bomb attack that destroys McGurk's Bar in Belfast. (4th Dec 1971) |
| 60th | Tanganyika becomes independent from Britain. (9th Dec 1961) |
| 75th | David Lean's film of Great Expectations released. (26th Dec 1946) |
| 80th | National Service Act passed: All men and women aged 18-60 are now liable to some form of national service. (18th Dec 1941) |
| 80th | World War II: UK declares war on Bulgaria. (12th Dec 1941) |
| 80th | World War II: The United Kingdom declares war on Finland in support of the Soviet Union during the Continuation War. (6th Dec 1941) |
| 90th | The Abbey Road Studios in London are opened by Sir Edward Elgar. (12th Dec 1931) |
| 90th | The British Parliament enacts the Statute of Westminster 1931, establishing legislative equality between the self-governing dominions of the Commonwealth of Australia, the Dominion of Canada, the Irish Free State, Dominion of Newfoundland, the Dominion of New Zealand, and the Union of South Africa. (11th Dec 1931) |
| 100th | The Anglo-Irish Treaty is signed in London by British and Irish representatives. (6th Dec 1921) |
| 125th | The Glasgow Underground Railway is opened by the Glasgow District Subway Company. (14th Dec 1896) |
Alternatively, see all anniversaries for this month.
Or... select a different date below:
