Europe Day (Council of Europe)

Europe Day is celebrated annually on 5 May and 9 May.

The Council of Europe designates 5 May, the anniversary of the Council’s founding.

https://www.coe.int/en/web/portal/5-may-europe-day

The European Union designates 9 May, the anniversary of the Schuman Declaration (1950).

https://european-union.europa.eu/principles-countries-history/symbols/europe-day_en

Neither date is listed as a flag flying day by UK government guidance, although the UK remains a member of the Council of Europe.

https://www.gov.uk/guidance/designated-days-for-union-flag-flying

Europe Day is listed on 9 May as a flag flying day by Scottish government guidance.

The European Flag is specified.

https://www.gov.scot/publications/flag-flying-on-government-buildings/