1) December observance
Found on
https://www.crosswordclues.com/clue/koninkrijksdag
Koninkrijksdag (Dia di Reino, Kingdom Day) is the commemoration of the signing of the Charter for the Kingdom of the Netherlands on 15 December 1954 in Aruba, Curaçao, the Netherlands, and Sint Maarten. When 15 December falls on a Sunday, the commemoration takes place on Monday 16 December. Kingdom Day is, unlike Koningsdag (King`s Day), not an ....
Found on
http://en.wikipedia.org/wiki/Koninkrijksdag
No exact match found.
