Polish Underground State's Day
Polish Underground State's Day is held on September 27. This event in the third decade of the month September is annual. 
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On the night of September 26-27, 1939, in besieged Warsaw, the Service for Poland's Victory was established (Służbę Zwycięstwu Polski). The task of this underground military organization was to fight the occupant.
The Day of the Underground Polish State was established by a resolution of the Sejm of the Republic of Poland on September 11, 1998. It expressed special gratitude and respect to the creators, devoted activists of the underground structures of the Polish State, as well as to all those who, in extremely difficult conditions, risked their own lives, fought for the independence of the homeland .
Similar holidays and events, festivals and interesting facts
European Researchers' Night on September 26
Boy's Day in Poland on September 30
World Multiplication Table Day on October 3 (Held on the first Friday in October);
Animals' Day in Poland on October 4 (Dzień Zwierząt, established in 2006);
Arbor Day in Poland on October 10 (Święta Drzewa);
Paramedics' Day in Poland on October 13
National Education Day in Poland on October 14 (formerly Teachers' Day)