December 6 Holidays, events and History 2021.
| Date | Day | Holiday Name | Holiday Type | Country |
| 6 Dec | Monday | Foundation of Quito | Local holiday | Ecuador |
| 6 Dec | Monday | King Bhumibol’s Birthday observed | National holiday | Thailand |
| 6 Dec | Monday | Day off for Anniversary of the Coronation of King Tupou I | Public Holiday | Tonga |
| 6 Dec | Monday | Independence Day | National holiday | Finland |
| 6 Dec | Monday | Constitution Day | Autonomous Community Holiday | Spain |