Memorial Day of the Martyrs Mamantus, Theodotus and Rufina of Caesarea
Celebrated on 15 SeptemberMemorial Day of the Martyrs Mamantus, Theodotus and Rufina of Caesarea
Other holidays on 15 September
- Losing Weight Day
- Free Money Day
- International Day of Democracy
- Secretary's Day in Russia
- Make a Hat Day
- Dream Coincidence Day
- Day of Workers of the Sanitary and Epidemiological Service of Russia
- Unity Day of the Peoples of Dagestan
- Library Day of the Republic of Belarus
- Memorial Day of Prince Oleg among the Slavs
- Birthday of the environmental organization Greenpeace Day
- Russian Forest Days
- Day of reunification of Primorye with the Fatherland in Slovenia
- Knowledge Day in Azerbaijan
- World Lymphoma Awareness Day
- Independence Day in Costa Rica
- International Dot Day
- According to the folk calendar - Mammoth Day
- Memorial Day of Saint John the Faster