Events in Poland
8 January - the PZL.4 passenger plane was tested.
13 January - sentences in the Brest trial of the Centrolew leaders were announced.
January 15 - in an apartment at ul. st. Gertrudy 6 in Krakow, the police detained 38 participants of the communist meeting of child carers and nurses. From among the detained, 12 people were arrested.
January 19 - Krakow police arrested two members of the Green Ribbon League, distributing leaflets calling for a boycott of Jewish stores.
February 8 - the Polish Vis pistol was patented.
February 18 - the beginning of the strike of the miners from Zagłębie Dąbrowskie and Chrzanowski. Four workers were killed in clashes with the police.
February 20 - the submarine ORP Żbik entered service.
February 25 - the Częstochowa Scientific Society was founded.
February - miners' strike in Poland.
March 6 - the 2nd International Piano Competition Frederic Chopin.
March 11 - the education reform, the so-called Jędrzejewicz reform.
March 16 - general strike of 300,000 workers, organized by the Central Commission of Trade Unions.
unemployment benefits were reduced by 38% and the payout period was shortened.
5 people were killed in clashes with the police during the strike in Pabianice.
March 23 - Aleksandr Juninskij from the USSR won the 1st Prize of the 2nd International Piano Competition Frederic Chopin.
April - strikes of agricultural workers in Poland.
April 3 - the National Labor Party was established.
April 20 - The Act on private schools and research and educational institutions entered into force.
15th of May:
The 3rd Congress of OM TUR began its deliberations in Piotrków.
in Pabianice, Jadwiga Wajs set the world record in discus throw with the result of 40.345 m.
May 29 - the Radium Institute of Maria Skłodowskiej-Curie, currently the National Oncology Institute Maria Skłodowskiej-Curie - National Research Institute.
June 1 - the Pieniny National Park was established.
June 3 - RWD-6 aircraft test flight.
in Warsaw, Edward Trojanowski set the Polish record in the 200 m race with a result of 22.0 seconds.
in Królewska Huta, Janusz Kusociński set a Polish record in the 1500 m race with a score of 3: 54.0 s.
June 14 - there was the so-called the Gdansk crisis, when the destroyer ORP Wicher entered the local port, enforcing the port d'attaché rights for Poland.
18-19 June - XI Polish Women's Athletics Championships. Three victories of Jadwiga Janowska: high - 1.43 m; in the distance - 5.07 m; 5-fight 3559.71 points and the world record of Jadwiga Wajs in a discus throw with the result of 42.43 m.
June 21 - The peasant revolt known as the Lesko Uprising begins.
June 23 - The Border Guard patrol boat ORP Batory, the oldest surviving Polish ship, entered service.
June 29 - Zygmunt Heljasz set the world record in shots in Poznań with the result of 16.05 m.
July 9 - the Lesko Uprising was suppressed.
July 11 - Makarewicz's code: reform of Polish criminal law (including legalization of homosexual contacts).
July 25 - Poland and the USSR signed a non-aggression pact in Moscow.
Janusz Kusociński won in Los Angeles the Olympic gold medal in the 10,000 m race with the result of 30: 11.4 seconds.
Gdynia was the first time when the Sea Festival was celebrated.
August 7 - the first Polish championship in individual speedway driving took place in Mysłowice.
August 10 - the flag is raised on the destroyer ORP Burza.
August 11 - the Białowieża National Park was created, known, among others, from the world's largest population of bison in the wild.
17 August - Vilnius-Porubanek Airport was opened.
August 28 - victory of Polish pilots Franciszek Żwirko and Stanisław Wigura (International Tourist Aircraft Competition).
September 1 - the new Penal Code entered into force.
2 September - a pows strike broke out