This is the international day of remembrance for the victims of the Holocaust and of other genocides.
The date is the anniversary of the liberation of Auschwitz-Birkenau. In 1933, when the Nazis came to power in Germany, there were over 9 million Jews in Europe.
The Nazi government in Germany launched a campaign to exclude and persecute Jews and
Tu B'Shevat is the New Year for Trees. "Tu" is the number 15 in Hebrew, and Tu B'Shevat is the fifteenth day of the month of Shevat.
Judaism has several different "new years", each with a different purpose, just as for example the calendar year or the school year in the Western calendar. Tu B'Shevat is the New Year for the purpose of