# The Flags Regulations (Northern Ireland) 2000, Part II: Days on which the union flag is to be flown at full mast


20th January
Birthday of the Countess of Wessex
6th February
Her Majesty’s Accession
19th February
Birthday of the Duke of York
A day in March to be notified by publication in the Belfast Gazette on or before 31st January annually
Commonwealth Day
10th March
Birthday of the Earl of Wessex
17th March
St Patrick’s Day
21st April
Birthday of Her Majesty the Queen
9th May
Europe Day
A day in June to be notified by publication in the Belfast Gazette on or before 31st January annually
Official Celebration of Her Majesty’s Birthday
2nd June
Coronation Day
10th June
Birthday of the Duke of Edinburgh
4th August
Birthday of Her Majesty Queen Elizabeth The Queen Mother
15th August
Birthday of The Princess Royal
21st August
Birthday of The Princess Magaret
12th November 2000 and, in subsequent years, a Sunday in November to be notified by publication in the Belfast Gazette on or before 31st January annually
Remembrance Day
14th November
Birthday of The Prince of Wales
20th November
Her Majesty’s Wedding Day

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Source: https://www.legislation.gov.uk/nidsr/2000/0337937729/schedule/part/II (the official version)
Page: https://openlegislation.uk/draft-flags-regulations-northern-ireland-2000/schedule/part-II
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.