21. 8. 1968 - Invasion of the Warsaw Pact troops, 21. 8. 1988 – 17. 11. 1989 – Street demonstrations against the communist regime, 1. 1. 1977 - Declaration of Chart 77, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia, 5. 1. - 21. 8. 1968 - The Prague Spring, 1. 1. 1977 - Declaration of Chart 77, 1976 – The Plastic People of the Universe trial

Perestroika, Dissolution of the Soviet Union

21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

17. 11. 1989 - Demonstration at Národní třída, 1. 1. 1977 - Declaration of Chart 77, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 4. 1969 – A. Dubček’s resignation, start of the “normalisation” period and 2 more anniversaries

17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

13 de Marzo Tugboat Sinking, Cuba after 1959, Triumph of the Revolution (Cuba)

Ukraine in 1990-s., The Repressions of the totalitarian regime in the 1970s in Ukraine, Perestroika, Ukraine in 1986–1991, 26 April 1986 - Chernobyl disaster and 5 more anniversaries