26 April 1986 - Chernobyl disaster

23. 2. 1949 – Beginning the forced agricultural collectivisation, 5. 1. - 21. 8. 1968 - The Prague Spring, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 16. 1. 1969 – Jan Palach´s self-immolation , 26 April 1986 - Chernobyl disaster and 3 more anniversaries

1. 9. 1939 - The outbreak of the WW2, 1941 - 1945 - Transports to the concentration camps, 26 April 1986 - Chernobyl disaster, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

21. 8. 1968 - Invasion of the Warsaw Pact troops, 26 April 1986 - Chernobyl disaster

26.8. 1980 Solidarity strike in Wroclaw , 26 April 1986 - Chernobyl disaster

27. 5. 1942 - Assassination of R. Heydrich, 1944 - 1945 - The liberation of Czechoslovakia, 25. 2. 1948 - Communist coup d‘état in ČSR, 5. 1. - 21. 8. 1968 - The Prague Spring, 21. 8. 1968 - Invasion of the Warsaw Pact troops and 2 more anniversaries

26 April 1986 - Chernobyl disaster

23. 2. 1949 – Beginning the forced agricultural collectivisation, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 25. 1. 1969 Jan Palach´s funeral, 26 April 1986 - Chernobyl disaster

1 November 1955 – 30 April 1975 - Vietnam War, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 5. 7. 1985 Pilgrimage to Velehrad, 26 April 1986 - Chernobyl disaster, 1989 - The fall of the iron curtain and 2 more anniversaries

Ukraine in 1986–1991, 26 April 1986 - Chernobyl disaster

26. 5. 1946 – The last “free” parliamentary election in Czechoslovakia, 1948 - 1955 - Politic lawsuit in the Stalin age, 23. 2. 1949 – Beginning the forced agricultural collectivisation, 9. 5. 1960 - Amnesty of political prisoners, 9. 5. 1962 – An extensive amnesty and 6 more anniversaries