Polish Statistics Day
Polish Statistics Day is held on March 9. This event in the first decade of the month March is annual. 
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Polish Statistics Day (Dzień Statystyki Polskiej) - a Polish holiday celebrated annually on March 9, adopted on December 2, 2008 at a meeting of the Statistics and Econometrics Committee of the Polish Academy of Sciences.
This day was chosen to commemorate the session of the Four-Year Sejm on March 9, 1789, during which Fryderyk Józef Moszyński justified the carrying out of a statistical census in Poland. As a result, on June 22 of the same year, the Seym proclaimed the census of the Polish-Lithuanian Commonwealth and passed a constitution called "Smoke inspection and administration of the population".
Similar holidays and events, festivals and interesting facts
St Casimir's Day on March 4 (Poland and Lithuania);
Men's Day in Poland on March 10
Kashubian Unity Day in Poland on March 19
Truant's Day on March 21 (Poland, Faroe Islands);
Day of Hungarian-Polish Friendship on March 23 (Hungary and Poland);
Dyngus Day on April 1 (It is very popular in Poland, as well as in Polish communities across America);
ABW Day in Poland on April 6 (Polish counter-intelligence agency's - ABW - holiday, celebrated since 2004)