| date | entity | event | name |
|---|---|---|---|
| 13/05/1984 | newspaper | date Ceased publication | La Voz de Córdoba |
| 13/05/1986 | observatory | date founded | Mount Pleasant Radio Observatory |
| 13/05/1885 | team | date Foundation | Aalborg Boldspilklub |
| 13/05/1995 | operating system | date released | Red Hat Linux |
| 13/05/1921 | organization | date founded | Kappa Epsilon |