Queen's Birthday

Short definition from Wiktionary

Proper noun

1. 1
   A holiday or observance commemorating a female monarch and observing her birth, including: the Queen's Official Birthday (observed on the Saturday falling between 11 and 17 June during the reign of Queen Elizabeth II (died 2022))
2. 2
   A holiday or observance commemorating a female monarch and observing her birth, including: the Queen's actual birthday (21 April in the case of Queen Elizabeth II)
3. 3
   A holiday or observance commemorating a female monarch and observing her birth, including: Victoria Day (last Monday before 25 May)
4. 4
   A holiday or observance commemorating a female monarch and observing her birth, including: Koninginnedag (in the Netherlands)