| date | entity | event | name |
|---|---|---|---|
| 28/09/1961 | former country | data end | United Arab Republic |
| 28/09/1933 | organization | date founded | GEMA (German organization) |
| 28/09/1867 | organization | date founded | Kappa Sigma Kappa |
| 28/09/2004 | organization | date founded | Ape Cognition and Conservation Initiative |
| 28/09/1953 | organization | date founded | Federación de Estudiantes de la Universidad de Costa Rica |