In Judaism, the New Moon ushers in a new month

Rosh Chodesh or Rosh ḥodesh (Hebrew: ראש חודש‎; trans. Beginning of the Month; lit. Head of the Month) is the name for the first day of every month in the Hebrew calendar, marked by the appearance of the new moon. The new moon is marked by the day and hour that the new crescent is observed. It is considered a minor holiday, akin to the intermediate days of Passover and Sukkot.^[1]

Saint David's day (Welsh: Dydd Gŵyl Dewi) is the feast day of Saint David, the patron saint of Wales, and falls on the 1st of March each year. The first day of March was chosen in remembrance of the death of Saint David. Tradition holds that he died on that day in 589.^[1] The date was declared a national day of celebration within Wales in the 18th century.

Cross-party support resulted in the National Assembly for Wales voting unanimously to make St. David's Day a public holiday in 2000. A poll conducted for Saint David's Day in 2006 found that 87% of people in Wales wanted it to be a bank holiday, with 65% prepared to sacrifice a different bank holiday to ensure this.^[2] A petition in 2007 to make St. David's Day a bank holiday was rejected by the office of the British Prime Minister, Tony Blair.^[3]

Remembrance Day (Marshall Islands), formally known as Nuclear Victims’ Day and Nuclear Survivors’ Day, occurs on March 1st and is a national holiday in the Marshall Islands. The day honors the victims and survivors of nuclear testing done in the area in the 1950's.

Castle Bravo was the code name given to the first U.S. test of a dry fuel thermonuclear hydrogen bomb device, detonated on March 1, 1954 at Bikini Atoll, Marshall Islands, as the first test of Operation Castle. Fallout from the detonation poisoned the islanders who had previously inhabited the atoll.