International Mother Earth Day is an annual global observance held on April 22. It was established in 2009 by the United Nations General Assembly. However, the tradition of celebrating Earth Day on April 22 began much earlier.
Many countries around the world celebrate International Holocaust Remembrance Day on January 27. Some also have their own memorial days to honor the victims of antisemitism and genocide in Nazi Germany. For example, Holocaust Remembrance Day in Serbia (Dan sećanja na žrtve holokausta) is observed on April 22.