| Date | Weekday | Event | Country | Type |
|---|---|---|---|---|
| 21 Sep | Sunday | Independence Day | Public | |
| 21 Sep | Sunday | Day of the Walloon Region | Belgium More... | Not public |
| 21 Sep | Sunday | Federal Day of Thanksgiving, Repentance and Prayer | Switzerland More... | Public |
| 21 Sep | Sunday | Kwame Nkrumah Memorial Day | Ghana More... | Public |
| 21 Sep | Sunday | Customs Service Day | Poland More... | Not public |
| 21 Sep | Sunday | International Day of Peace | global | Other |