Maslenitsa
Maslenitsa (Russian: Ма́сленица, Ukrainian: Ма́сляниця, Belarusian: Ма́сьленіца), also known as Butter Week, Pancake week, or Cheesefare Week, is a Russian religious and folk holiday. It is celebrated during the last week before Great Lent—that is, the seventh week before Pasha (Easter). Maslenitsa corresponds to the Western Christian Carnival, except that Orthodox Lent begins on a Monday instead of a Wednesday. The Orthodox date of Easter can differ greatly from the Western Christian date. In 2008, for example, Maslenitsa was celebrated from March 2 to March 8.

Maslenitsa has a dual ancestry: pagan and Christian. In Slavic mythology, Maslenitsa is a sun festival, celebrating the imminent end of the winter.
On the Christian side, Maslenitsa is the last week before the onset of Great Lent. During Maslenitsa week, meat is already forbidden to Orthodox Christians, making it a myasopustnaya nedelya (Russian: мясопустная неделя, English "meat-empty week" or "meat-fast week"). It is the last week during which milk, cheese and other dairy products are permitted, leading to its other name of "Cheese-fare week" or "Butter week". During Lent, meat, fish, dairy products and eggs are forbidden. Furthermore, Lent also excludes parties, secular music, dancing and other distractions from the spiritual life. Thus, Maslenitsa represents the last chance to partake of dairy products and those social activities that are not appropriate during the more prayerful, sober and introspective Lenten season.
Russia Day

In addition, by the late 1980s, society had begun to doubt the Politburo's ability to carry out meaningful socio-economic reforms. The creation of the post of the President of the Russian Federation and the adoption of the new Russian Constitution to reflect the new political reality, along with the national flag, anthem and emblem of the Russian Federation, were major landmarks in the consolidation of Russian statehood.
The country's new name- the Russian Federation (Russia)- was adopted on December 25, 1991. The day when the declaration was adopted- June 12 - was proclaimed as national holiday by Supreme Soviet of Russia in 1992, and again proclaimed Russia's national holiday by the Russian President's decree of June 2, 1994. Under the presidential decree of June 16, 1998, it was called the Day of Russia. In 2002, the new Labor Code gave official seal to this title.
International Women's Day

In many regions, the day lost its political flavour, and became simply an occasion for men to express their love for women in a way somewhat similar to a mixture of Mother's Day and St Valentine's Day. In other regions, however, the original political and human rights theme designated by the United Nations runs strong, and political and social awareness of the struggles of women worldwide are brought out and examined in a hopeful manner.
The mimosa (technically, the Silver Wattle) is the symbol of the celebrations of Women's day in Italy and Russia.
Tatiana Day
Tatiana Day (Russian: Татьянин день, Tatyanin den' ) is a Russian religious holiday observed on January 25 according to the Gregorian calendar, January 12 according to the Julian. It is named after Saint Tatiana, a Christian martyr in 3rd century Rome during the reign of Emperor Alexander Severus.
In 1755 on the name day of Ivan Shuvalov's mother Tatiana Rodionovna, his mistress Empress Elizabeth of Russia endorsed his petition to establish a university in Moscow. The church of Saint Tatiana was later built in the university campus, the Russian Orthodox Church declared Saint Tatiana the patron saint of students, and Tatiana Day has become celebrated as Russian Students Day.
Victory Day
The Soviet Victory Day or 9 May marks the capitulation of Nazi Germany to the Soviet Union in the Second World War (also known as the Great Patriotic War in the Soviet Union and some post-Soviet states). It was first inaugurated in the fifteen republics of the Soviet Union, following the signing of the surrender document late in the evening on 8 May 1945 (9 May by Moscow Time). It happened after the original capitulation that Germany earlier agreed to the joint Allied forces of the Western Front. The Soviet government announced the victory early on 9 May after the signing ceremony in Berlin. Though the official inauguration happened in 1945 (which means it has been celebrated since 1946), the holiday became a non-labour day only in 1965 and only in some of the countries.

In 1988,just before the collapse of the Soviet Union, Victory Day ceased to be observed in Uzbekistan, but was partially restored in 1999 as Memorial/Remembrance Day.After their separation from the Soviet Union, the Baltic countries now commemorate the end of WWII on 8 May, the Victory in Europe Day.
New Year's Eve
New Year's Eve is observed on December 31, the final day of the Gregorian calendar, the day before New Year's Day. New Year's Eve is a separate observance from the observance of New Year's Day. In modern practice, fireworks, music, other forms of noisemaking, and alcoholic beverages are common elements of the New Year's Eve celebration.
New Year's Eve is often celebrated with parties and social gatherings spanning the transition of the year at midnight.
New Year

Christmas

In the night of the 7th of January (according to the orthodox calendar) is Christmas. In Christmas holidays people try to be better, purer (cleaner); it is the time when Christian values take peculiar importance (meaning), it is time for good deeds. Christmas-is the holiday of waiting for miracles. As once it had happened in Vifliem - the Rescuer of humanity was born, so it must happen every year on this day. That's why both grown-ups and children are waiting for Christmas with such impatience and even though miracle doesn't take place the holiday is very nice with its unique mixture of folk and Christian customs and tradition.
Old New Year
Old New Year - January 13: holiday in memory of Old Calendar New Year. Celebarated as a family holiday.
Easter

Easter is hold on the 1st Sunday after the vernal equinox and it is celebrated solemnly and merrilly. The date of Easter is usually determined by the church calendar and calculate according to so-called paskhalias - the special tables.
Defender of the Fatherland Day

Red Army in Petrograd and Moscow or of the first combat action against the invading German forces).
The holiday is celebrated with parades and processions in honor of veterans, and women also give small gifts to the Russian men in their lives, especially husbands (or boyfriends), fathers and sons. As a part of the workplace culture, women often give gifts to their male co-workers. Consequently, in colloquial usage, the holiday is often referred to as Men's Day
Kupala Day

Some early mythology scholars, such as Sir James Frazer, claimed that the holiday was originally Kupala; a pagan fertility rite later accepted into the Orthodox Christian calendar. There are analogues for celebrating the legacy of St. John around the time of the summer solstice elsewhere, including St. John's Day in Western Europe.
The Russian name of this holiday combines "Ivan", Russian for the name John (the Baptist), and Kupala which is related to a word derived from the Slavic word for bathing, which is cognate. The latter is reinterpreted as John's baptizing people through full immersion in water (therefore his biblical title of the Baptist). However, the tradition of Kupala predates Christianity, due to correlation to a pre-Christian Slavic god or goddess. Due to the popularity of the pagan celebration that with time it was simply accepted and reestablished as one of the native Christian traditions intertwined with local folklore. On rare occasions it is spelled as Ivanna Kupala (Joann) representing the tradition as feminine.
The holiday is still enthusiastically celebrated by the younger people of the Eastern Europe. The night preceding the holiday (Tvorila night) is considered the night for "good humour" mischiefs (which sometimes would raise concerns of law enforcement agencies). On Ivan Kupala day itself, children are engaged in water fights and perform pranks mostly involving pouring water over someone.
The International Day of Children Defendence

Trinity is the unity of three God's faces: God Father, God Son and Sacred Spirit. It is a Chritian holyday. It is celebrated on the 50th day after Easter hence it follows its another name-Pyatidesyatnitsa (the 50th day).
On this day Holy Spirit went down on the Apostles and gave them Christ's instructions to spread news of Christianity to all the peoples and languages. This holiday is hold according to folk rites.
The dwellings are decorated with twigs of birch. People remember the deceased. In the evening people sing and dance in rings. In Russia Whitsunday merged with the Semic holiday. It is the esteem of plant Spirits. People also celebrate the Parents' Saturday.
Teacher's Day
Teacher's Day - October 5: This special day was created to focus the World's attention on the contributions and achievements of teachers as well as their concerns and priorities.
The Day of laughter

Recently this fun holiday didn't celebrate everywhere but nowadays it has become a custom. Everybody tries to play a trick on others.
May 1
