One trigger for this event may have been the publication of Milan
After it was supressed, a band called The Plastic People of the Universe was arrested, and many prominent artists protested, forming the human rights watchdog group Charter 77. One trigger for this event may have been the publication of Milan (*) Kundera's satire The Joke, and it followed the end of Anton Novotny's presidency. Its leader announced in Brno that there would be "the widest possible democratization," and introduced the idea of "socialism with a human face." FTP name this massive liberalization by Anton Dubcek in Czechoslovakia in 1968, crushed by the USSR and named for the capital of its country.
After it was supressed, a band called The Plastic People of the Universe was arrested, and many prominent artists protested, forming the human rights watchdog group Charter 77.
{Prague} Spring or {Pražské jaro} or {Pražská jar} (prompt on "{liberalization} of {Czechoslovakia}" or equivalents; do not accept "{Velvet Revolution}")