— Ukrainian Unity Day, marking both the 1918 Fourth Universal of the Ukrainian Central Council and the 1919 Unification Act 2 February — Candlemas in the Gregorian Calendar (Catholics, Protestants and some parishes of the Orthodox Church of Ukraine) 15 February — Candlemas in the Julian Calendar (Orthodox Church of Ukraine) 20 February - Day of Remembrance of the Fallen Martyrs of Euromaidan, the Heavenly Hundred Heroes 21 February — Anniversary of the 2014 victory of the Revolution of Dignity 24 February — Mourning Day of the Beginning of the 2022 Russian invasion of Ukraine (beginning 2023) 26 February — Day of Resistance to Occupation of Crimea and Sevastopol 25 March- Day of the Security Service of Ukraine 11 May — Saints Cyril and Methodius' Day in the Gregorian Calendar (also Slavonic Literature and Culture Day) (Catholics, Protestants and some parishes of the Orthodox Church of Ukraine) 24 May — Saints Cyril and Methodius' Day in the Julian Calendar (also Slavonic Literature and Culture Day) (Orthodox Church of Ukraine) 22 June — Day of Remembrance and Sorrow (Anniversary of the Beginning of the Second World War in Ukraine and territories of the former Soviet Union) 23 June — Day of the Ukrainian Civil Service 24 June — Kupala Night in the Gregorian Calendar (Catholics, Protestants and some parishes of the Orthodox Church of Ukraine) 28 June — Constitution Day 7 July — Kupala Night in the Julian Calendar (Orthodox Church of Ukraine) 16 July — Anniversary of the Declaration of State Sovereignty of Ukraine 28 July — Day of Christianization of Kievan Rus' — Ukraine 6 August — Feast of the Transfiguration / Apple Feast of the Saviour in the Gregorian Calendar (Catholics, Protestants and some parishes of the Orthodox Church of Ukraine) 15 August — Feast of the Assumption and Dormition of the Mother of God in the Gregorian Calendar (Catholics, Protestants and some parishes of the Orthodox Church of Ukraine) 19 August — Feast of the Transfiguration / Apple Feast of the Saviour in the Julian Calendar (Orthodox Church of Ukraine) 23 August — National Flag Day 28 August — Feast of Dormition of the Mother of God in the Julian Calendar (Orthodox Church of Ukraine) 29 August — Day of Remembrance of the Defenders of Ukraine, remembrance day of the great Ukrainian casualties during the Battle of Ilovaisk on August 29, 2014 31 August — Cincture of