Burundi
| Date | Weekday | Event | Country | Type |
|---|---|---|---|---|
| 21 Oct | Tuesday | Ndadaye Day | Burundi | Public |
| 21 Oct | Tuesday | Festival of Lights | Not public | |
| 21 Oct | Tuesday | Diwali | Mauritius | Public |
| 21 Oct | Tuesday | Third Day of Constitution Day | Niue | Public |
| 21 Oct | Tuesday | Remembrance Day | Serbia | Not public |
| 21 Oct | Tuesday | Deepavali | Singapore | Public |
| 21 Oct | Tuesday | National Annual Tree Loving Day | Thailand | Not public |
| 21 Oct | Tuesday | National Dental Hygiene Day | Thailand | Not public |
| 21 Oct | Tuesday | National Nurses' Day | Thailand | Not public |
| 21 Oct | Tuesday | Vegetarian Festival | Thailand | Not public |
| 21 Oct | Tuesday | Overseas Chinese Day | Taiwan | Not public |
| 21 Oct | Tuesday | Saint Ursula's Day | British Virgin Islands | Public |