Pesah, or Passover is one of the most significant Jewish holidays. It commemorates the liberation of the Jewish people from slavery in ancient Egypt and the story of the Exodus. This festival commences on Nisan 15 and lasts for seven days in Israel and for eight days in the diaspora.
World Parkinson's Day, also referred to as World Parkinson's Disease Day or World Parkinson's Awareness Day, is an annual global awareness day aimed at promoting a better understanding of this health condition. It is observed on April 11.
International Louie Louie Day is an annual holiday dedicated to Richard Berry and his famous rhythm and blues song “Louie Louie”. It is celebrated on April 11 (Richard Berry's birthday).
In some countries, April 11 is observed as Day of Nazi Concentration Camps Prisoners Liberation. It marks the anniversary of liberation of Buchenwald concentration camp in 1945.