7 January: Russian Orthodox Christmas
24 May: Day of the Cyrillic alphabet
6 June: UN Russian Language Day / Pushkin Day
12 June: Russia Day
Fact and figures
Russian is spoken as a primary language by about 175 million people.
It is in the top 10 of languages most spoken (by native speakers).
From 1700 to 1918 the Julian calendar was used in Russia: you have to count +13 calendar days to know the date according to the Gregorian calendar (aka the Western calendar or Christian calendar).
Ivan the Terrible wasn't considered so terrible at his time: Иван Грозный should be translated as Ivan the Awesome, reflecting his might rather than his cruelty.
the Russian flag