538 days are past since May 21, 2023
| Date | Weekday | Event | Country | Type |
|---|---|---|---|---|
| 21 May | Sunday | Navy Day | Chile | Public |
| 21 May | Sunday | Independence Day | Montenegro | Public |
| 21 May | Sunday | Abolition Day | Saint Martin | Public |
| 21 May | Sunday | Saint Helena Day | Saint Helena, Ascension and Tristan da Cunha | Public |
| 21 May | Sunday | Father's Day | Tonga | Non Public |
| 21 May | Sunday | Sunday of Europe Day Weekend | Ukraine | Non Public |