HM the Queen Mother's Birthday and National Mother's Day (Thailand)

Sirikit is a member of the Thai royal family who was Queen of Thailand from 28 April 1950 to 13 October 2016 as the wife of King Bhumibol Adulyadej. She is the mother of King Vajiralongkorn.

Mother's Day is a celebration honoring the mother of the family or individual, as well as motherhood, maternal bonds, and the influence of mothers in society. It is celebrated on different days in many parts of the world, most commonly in March or May. It complements similar celebrations honoring family members, such as Father's Day, Siblings Day, and Grandparents' Day.

Thailand, is a country in Southeast Asia on the Indochinese Peninsula. It is officially the Kingdom of Thailand and historically known as Siam, the official name until 1939. With a population of almost 66 million, it spans 513,115 square kilometres (198,115 sq mi). Thailand is bordered to the northwest by Myanmar, to the northeast and east by Laos, to the southeast by Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the southwest by the Andaman Sea; it also shares maritime borders with Vietnam to the southeast and Indonesia and India to the southwest. Bangkok is the state capital and largest city.