Short answers, pulled from the story.
Kuzma Minin and Prince Dmitry Pozharsky led the popular uprising that expelled Polish-Lithuanian invaders from Moscow. This event ended foreign control over the capital city during the Time of Troubles.
The State Duma passed the final vote to establish Unity Day on the 27th of December 2004. Vladimir Putin received an address from youth supporters of the initiative before this legislative action took place.
Only 8 percent of Russians knew the name of Unity Day according to polling data from 2005. Just four percent understood that the holiday commemorated the liberation of Moscow from Polish-Lithuanian invaders at that time.
State-organized official ceremonies occur at monuments like the Monument to Minin and Pozharsky located in Red Square. President Dmitry Medvedev offered flowers to this monument in 2008 during the observance.
Tsar Mikhail Romanov established a holiday named Day of Moscow’s Liberation from Polish Invaders in 1613 to honor the expulsion of foreign forces. The Russian Empire celebrated this date annually as it marked the end of internal civil war known as the Time of Troubles.