Poland

 Russia

January 1 - New Years Day
Easter Sunday
Easter Monday
May 1 - Labor Day
May 3 - Constitution Day
Variable date - Pentecost Sunday
Variable date - Corpus Christi
August 15 - Assumption of Mary
November 1 - All Saints Day
November 11 - Independence Day
December 24 - Christmas Eve
December 25 - 1st day of Christmas
December 26 - 2nd day of Christmas

January 1 New Year
January 7 Christmas
January 14 New Year according to Julian Calendar
January 25 Tatiana Day
February 14 Valentines Day
February 23 Defender of the Fatherland Day
March 8 International Womens Day
A week before the Great Lent Maslenitsa
April Easter
May 1 Spring and Labour Day
May 9 Victory Day
June 12 Russia Day
July 7 Ivan Kupala (St. John the Baptists Day)
August Troitsa (the Trinity)
November 4 Unity Day