| Date | Weekday | Event | Country | Type |
|---|---|---|---|---|
| 21 Sep | Saturday | Independence Day | Public | |
| 21 Sep | Saturday | Valentine's Day | Colombia More... | Not public |
| 21 Sep | Saturday | Kwame Nkrumah Memorial Day | Ghana More... | Public |
| 21 Sep | Saturday | Customs Service Day | Poland More... | Not public |
| 21 Sep | Saturday | National CleanUp Day | United States More... | Not public |
| 21 Sep | Saturday | Batman Day | global | Other |
| 21 Sep | Saturday | Oktoberfest | global | Other |
| 21 Sep | Saturday | International Day of Peace | global | Other |