December 20 Anniversaries

International Human Solidarity Day

World Observances

What Is International Human Solidarity Day? December 20 is "International Human ...

Foghorn Day

Historical Anniversaries

What Is Foghorn Day? Every December 20th is "Foghorn Day" (霧笛記念日, Muteki Kinenbi...

Department Store Opening Day

Historical Anniversaries

What Is Department Store Opening Day? Every December 20th is "Department Store O...