| April | |
| 2 | Good Friday/Holy Friday (Christian) |
| 2 | World Autism Day |
| 4 | Pesach/Passover ends (Judaism) |
| 4 | International Day for Mine Awareness |
| 5 | 1997: Bringing them Home, the Stolen Children Report - National Inquiry into the Separation of Aboriginal and Torres Strait Islander Children from Their Families |
| 7 | World Health Day |
| 12 | International Day for Street Children |
| 13 | Ramadan begins (Islam) - ends 12 May 2021 |
| 22 | International Earth Day |
| 25 | Anzac Day |
| 28 | Pay it Forward Day |
| 29 | Remembrance of Victims of Chemical Warfare |
| 30 | Great Friday (Orthodox Christian) |
| May | |
| 2 | Pascha/Easter (Orthodox Christian) |