Greece

 Russia

January 1 - New Years Day
January 6 - Epiphany Day
March 25 - Greek Independence Day
Clean Monday - Variable date
Good Friday - Variable date
Easter Monday - Variable date
Holy Spirit Day - Variable date
May 1 - Labour Day
August 15 - Assumption of Mary
October 28- Greek National Day
December 24 - Christmas Eve
December 25 - Christmas Day
December 26 - Boxing Day

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