| Arbor Day |
USA (Delaware) |
| Arbor Day |
USA (Nebraska) |
| Discovery Day |
Brazil |
Earth Day |
Canada |
Earth Day |
Palau |
Earth Day |
USA |
|
Easter
(Coptic) |
Armenia |
| Easter (Coptic) |
Bulgaria |
Oklahoma Day |
United States of America |
| Orthodox Easter |
Belarus |
| Orthodox Easter |
Bosnia-Herzegovina |
| Orthodox Easter |
Macedonia |
| Orthodox Easter |
Ukraine |
| Queen Isabella Day |
Spain |
|
