The birthday of the Earl of Forfar (Duke of Edinburgh) is an official flag flying day only in Scotland, not in the rest of the UK.
https://www.gov.scot/publications/flag-flying-on-government-buildings/
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Flag days
Sep
29
Fri
2023
all-day
Westmorland Day: Creation of Ear...
Westmorland Day: Creation of Ear...
Sep 29 all-day
Westmorland Day takes place annually on 29 September. It marks the date in 1397, when King Richard II created Ralph Neville the first Earl of Westmorland. A poll at the Westmorland County Show (2013) chose[...]
Oct
1
Sun
2023
all-day
Lincolnshire Day: Anniversary of...
Lincolnshire Day: Anniversary of...
Oct 1 all-day
Lincolnshire Day takes place annually on 1 October. It commemorates the Lincolnshire Rising, which began at Louth on 1 October 1536. The rebels were protesting against the English Reformation and the Dissolution of the Monasteries.
all-day
World Vexillology Day
World Vexillology Day
Oct 1 all-day
World Vexillology Day commemorates the debut of Flag Bulletin (October 1961), the world’s first periodical dedicated solely to vexillology. There is no special flag for this day – just go out and fly flags!
Oct
19
Thu
2023
all-day
Oxfordshire Day: Feast of St Fri...
Oxfordshire Day: Feast of St Fri...
Oct 19 all-day
Oxfordshire Day is celebrated on 19 October, the principal feast day of St Frideswide, the patron saint of the city and university of Oxford. Frideswide (c.650 – 19 October 727) was an English princess and[...]
