The demonstrations in August, marking the actual anniversary of the 1968 invasion, were the first cracks appearing in the communist rule.

The Wenceslas Square demonstration in Prague began at 5 pm on 21 August. The nearly two thousand youngsters first applauded, and then repeatedly sang the Czechoslovakian national anthem.
Some members of the Hungarian opposition put up a banner with the words “We came with flowers, not with a tank”. The police were tearing up the banner.
György Kerényi (a member of the Worker Solidarity Trade Union) is reading the message of the Hungarian workers apologizing on behalf of the Hungarians for the 68th invasion.
György Kerényi is on the shoulder of Tamás Deutch (FIDESZ/Alliance of Young Democrats) while reading the message.
The authorities called on the protesters to leave, but they did not comply and repeatedly sang the Czechoslovakian national anthem. The demonstration was revolted by the riot police, with a total of 376 Czechoslovaks and foreigners were arrested.
Following the afternoon’s demonstration, several groups gathered together several times in the street leading to the square but the police kept clean the streets. The last such action was around 10 pm. I took this picture from my hotel room. The police wanted to evacuate me for “my security” reason, but I paid the booking in advance and insisted to stay.
A shop window on the street the following morning. The poster calls for a celebration of the Slovak National Uprising in 1944.