||New Year's Day
||Celebrated in honour of one of micronationalism's most famous figures: Norton I, Emperor of the United States of America and Protector of Mexico.
||Demand Improvement Day
||Observed for the first time in 2012, Demand Improvement Day is a day intended for protesting against strange things. Designed to counter Waitangi Day protests by radical groups every year, the first Demand Improvement Day was based around demands that a motorway be constructed from the town of Puhoi, Auckland to the Northland city of Whangarei.
||Celebrates Bradford becoming the capital of Sirocco in 2014. (Kinross only)
||Observed every four years as a special occasion. February 29 was unofficially observed in 2004 and 2008, and was formally recognised for the first time in 2012.
||Celebrates the establishment of the Dominion of Zona. (Chai, Konson and Zageta only)
||Tent Pegs Day
||Celebrates the successful defence of Alston during the Tent Pegs border incident. (Cambria only)
||Friday before Easter Sunday
|Sunday after Good Friday
|Monday after Easter Sunday
||Celebrates the annexation of Greater Hagley, Maxia, Sandford and Trinity. (Greater Hagley, Maxia, Sandford and Trinity only)
||Celebrates the annexation of Blacksands. (Blacksands only)
||Originally honoured the Australian and New Zealand Army Corps who fought at Gallipoli during World War I, now commemorates by extension the service of all who have participated in military operations.
||Despite not actually being in the middle of the year, June 15 is celebrated as it is in the middle of the middle month. Celebrations are always held at midday on Midyear Day and have done so since 2005.
||Celebrates the creation of the Maran District, a forerunner to the modern Siroccan state. (Cambria only)
||Atomic New Year
||First day of the year in the Atomic calendar.
||Celebrates the establishment of Havilland, Wellesley. (Wellesley only)
||Celebrates the beginning of Sirocco's construction.
||Celebrates the annexation of Stirling. (Stirling only)
||Celebrates the annexation of Gillies Island.
||Celebrated as an alternative national day to Waitangi Day.
||This day arose as a joke between Daniel Anderson and Jesse Coles in 2008, whereby it was agreed that neither "believed" in September 27. While the day is not an official holiday, it is marked and "ignored" every year in Sirocco, with the running joke that the calendar jumps from September 26 to September 28 with no break. September 27, is however officially recognised as a legitimate day by the Government despite the joke.
||Celebrates the annexation of Watchman Island. (Watchman only)
||Celebrated in a significant portion of the micronational community as a day for frivolity.
||Commemorates the anniversary of Maxie Anderson's death. (Cambria and Kinross only)
||Second Monday in Grable
||Celebrates the founding of the Federal Commonwealth of Sirocco in 2010.
||Commemorates those who have died in military service for their country.
||Celebrates the release of the Windows 1.0 operating system and its successors.
||Celebrates capitalist goals and the pursuit of improvement. Considered the business equivalent of Labour Day.
||Anniversary of the elevation of Halvorson to a province on December 12, 2011. (Halvorson only)
||December 26 is celebrated as Dependency Day instead of Boxing Day in the Castor and Gillies Dependencies and the Muldoon Protectorate in honour of the annexation of the Castor Dependency on December 26, 2010.
||Celebrates the annexation of Castor. (Castor only)
||Victory over Communism Day
||Celebrates the day following the fall of the USSR in 1991.
||New Year's Eve