Significant Days

The Czech government has 15 days which are designated as významné dny which translates to "significant days."  These are days worth paying attention to but they are not public holidays.  In other words, there's no day off as these are all working days.  

16 January is Jan Palach Remembrance Day.  It commemorates his self-immolation in 1969.

27 January is Holocaust Remembrance Day and the prevention of crimes against humanity.  It remembers the 1945 liberation of the Nazi concentration and extermination camp Auschwitz-Birkenau.

8 March is International Women's Day.  

9 March is Remembrance Day for the Victims of the Extermination of the Terezín Family Camp in Auschwitz-Birkenau in 1944.

12 March is the Day of Accession of the Czech Republic to the North Atlantic Treaty Organization.  This commemorates the day Czechia joined NATO in 1999.

28 March commemorates the birth date of Jan Amos Komenský in 1592.

7 April is Education Day.  It commemorates the founding of Charles University in Prague in 1348.

5 May remembers the May Uprising of the Czech People which took place in 1945.

15 May is International Family Day.

10 June is the Memorial Day for the Victims of the Extermination of Lidice which took place in 1942.

18 June is the Day of the Heroes of the Second Resistance which commemorates the fight in Prague's Church of Saints Cyril and Methodius that took place in 1942.

27 June is Memorial Day of the Victims of the Communist Regime and pays respect to the 1950 execution of Milada Horáková.

21 August is Remembrace Day for the Victims of the Invasion and Subsequent Occupation by Warsaw Pact Troops.

8 October is Memorial Day of the Falconry.  In 1941 the Nazi Reich Protector Reinhard Heydrich issued a decree in 1941 for the dissolution of the Czechoslovak Sokol community.

11 November is War Veterans Day.  It commemorates the end of WWI in 1918.  This is the same as Armistice Day.

Update:  There's now a 16th significant day, the Day of Czechs Abroad.