| date | entity | event | name |
|---|---|---|---|
| 17/09/1882 | encyclical | date | Auspicato concessum |
| 17/09/2011 | roller coaster | date Opened | BuzzSaw (roller coaster) |
| 17/09/1985 | file system | date released | Hierarchical File System |
| 17/09/1936 | newspaper | date founded | Juventud Comunista (newspaper) |
| 17/09/1991 | newspaper | date founded | Napi Gazdaság |