| Date | Weekday | Event | Country | Type |
|---|---|---|---|---|
| 21 Sep | Monday | Independence Day | Public | |
| 21 Sep | Monday | Day of Atonement | Argentina More... | Not public |
| 21 Sep | Monday | Kwame Nkrumah Memorial Day | Ghana More... | Public |
| 21 Sep | Monday | Yom Kippur | Public | |
| 21 Sep | Monday | Respect for the Aged Day | Japan More... | Public |
| 21 Sep | Monday | Customs Service Day | Poland More... | Not public |
| 21 Sep | Monday | International Day of Peace | global | Other |