What happened to flags on 11 October
2 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Italy 1796
The Italian national colours appeared for the first time in Genoa on a tricolour cockade on 21 August 1789, anticipating by seven years the first green, white and red Italian military war flag, which was adopted by the Lombard Legion in Milan on 11 October 1796.
From Flag of Italy on Wikipedia, as it read on 2026-08-29
- Ethiopia 1897
On 11 October 1897, a year after Ethiopia decisively defeated the Kingdom of Italy at the Battle of Adwa, emperor Menelik II ordered the three pennants combined in a rectangular tricolour from top to bottom of red, yellow, and green with the first letter of his own name (the Amharic letter "ም") on the central stripe.
From Flag of Ethiopia on Wikipedia, as it read on 2026-08-26
How a day gets onto this site
A flag is here because a sentence in its own English Wikipedia article puts it on this date, and that sentence is printed above. Nothing was worked out from a year, and nothing was written for the occasion. Every sentence names the article it came from and the version of that article it was read in, so you can go and check it.
The calendar is still short rather than full. A third of the year has no page here, because a flag only gets a day when a sentence in its article puts something on one, and plenty of articles never do. Nothing is invented to fill the gap.