October 15 Holidays, events and History 2021.
| Date | Day | Holiday Name | Holiday Type | Country |
| Oct 15 | Friday | Durga Puja | National Holiday | Bangladesh |
| Oct 15 | Friday | Chung Yeung Festival | National Holiday | Hong Kong |
| 15 Oct | Friday | Commemoration Day of King’s Father | Public Holiday | cambodia |
| 15 Oct | Friday | Cayenne Festival | Common local holiday | French Guiana |
| 15 Oct | Friday | Martyrdom of Imam Hasan al-Askari | National holiday | Iran |