Source-backedFixed AnnualIn-depth guide
Smart Irrigation Month
The Irrigation Association describes Smart Irrigation Month as an annual initiative held each July and published current 2026 campaign materials.
Observance library
Browse all researched observances
2,411 researched observances. Search for a specific name or known alternate name.
Source-backedFixed AnnualIn-depth guide
Sneak Some Zucchini onto Your Neighbors' Porch Day
The first-party Wellcat Holidays calendar lists Sneak Some Zucchini onto Your Neighbors' Porch Day on August 8 and identifies the Wellcat Holidays collection as created by Thomas and Ruth R…
Source-backedRule Based AnnualIn-depth guide
Social Justice Sunday
The Australian Catholic Bishops’ social-justice office verifies the current last-Sunday-in-August rule, the former last-Sunday-in-September schedule and the change from 2020.
Source-backedFixed AnnualIn-depth guide
Social Media Day
Michigan government states that Mashable launched Social Media Day in June 2010 and documents 30 June as the annual date, including a 2026 Michigan proclamation.
Source-backedFixed AnnualIn-depth guide
Solemnity / liturgical feast of Our Lady of Candelaria
Candelaria City Council documents the February 2 solemnity separately from the August 15 celebration and traces the local February observance to the first Fiesta de las Candelas on 2 Februa…
Source-backedFixed AnnualIn-depth guide
Solemnity of All Saints
Current Vatican material identifies November 1 as the Solemnity of All Saints and traces the collective feast to early Christian commemoration of martyrs, including the 609/610 dedication o…
Source-backedEdition SpecificIn-depth guide
Solemnity of Saint Joseph, Spouse of the Blessed Virgin Mary
Holy See and Catholic liturgical sources identify 19 March as the normal Solemnity of Saint Joseph; official Vatican material also documents transfers when liturgical precedence requires an…
Source-backedFixed AnnualIn-depth guide
Solemnity of Saint Justus (San Giusto), martyr and patron of Trieste
The Diocese of Trieste identifies Saint Justus as principal patron of the city and diocese, celebrates his solemnity on November 3, dates his martyrdom to 303 and documents early local cult…
Source-backedFixed AnnualIn-depth guide
Solemnity of Saints Peter and Paul, Apostles
Holy See sources identify June 29 as the Catholic Solemnity of Saints Peter and Paul and document the 2026 papal celebration on that date.
Source-backedFixed AnnualIn-depth guide
Solemnity of the Assumption of the Blessed Virgin Mary
Vatican sources identify August 15 as the Solemnity of the Assumption, document an established August 15 celebration by the fifth century, and distinguish that ancient feast from Pope Pius…
Source-backedFixed AnnualIn-depth guide
Solemnity of the Immaculate Conception of the Blessed Virgin Mary
Vatican sources identify December 8 as the Solemnity of the Immaculate Conception, trace medieval devotion, state that Clement XI established the feast for the whole Church in 1708, and pub…
Source-backedFixed AnnualIn-depth guide
Solemnity of the Nativity of the Lord (Christmas)
Vatican sources establish the current 25 December Roman Catholic solemnity and identify evidence of celebration by 336 while preserving uncertainty about a single founder or one uncontested…
Source-backedFixed AnnualIn-depth guide
Somalia Independence Day
Somalia government sources verify July 1, 1960 southern independence and union into the Somali Republic, annual July 1 commemoration and current national-holiday treatment. Current official…
Source-backedFixed AnnualIn-depth guide
Southern Africa Liberation Day
SADC says its 2018 Summit endorsed 23 March as Southern Africa Liberation Day and that SADC commemorates it every year on that date.
Source-backedFixed AnnualIn-depth guide
Soviet Occupation Day (Georgia)
The Parliament of Georgia states that its 21 July 2010 resolution officially recognized 25 February as Soviet Occupation Day, tied to the 25 February 1921 capture of Tbilisi; current parlia…
Source-backedFixed AnnualIn-depth guide
Spanish Language Day
United Nations language observance
Source-backedFixed AnnualIn-depth guide
Speak Up For Service Day
National Day Calendar’s founder record states that Mandan Lions Club founded Speak Up For Service Day in 2014 and that it is celebrated annually on October 30.
Source-backedFixed AnnualIn-depth guide
Special Education Day
The Special Education Day organization identifies December 2 as the observance and says it was launched in 2005 to mark the anniversary of the 1975 federal special-education law.
Source-backedHistorical LegacyIn-depth guide
Special Operations Forces Day
New York Assembly proceedings record a resolution memorializing the governor to proclaim June 15, 2016 as Special Operations Forces Day in the State of New York. No evergreen national recur…
Source-backedEdition SpecificIn-depth guide
Spinal Cord Injury Awareness Day
Spinal Injuries Association describes SCIAD as an annual UK event; charity and parliamentary records show that its exact May date changes by edition, including 21 May 2021, 16 May 2025 and…
Source-backedRule Based AnnualIn-depth guide
Spirit of ’45 Day
A U.S. congressional concurrent resolution supports observance of Spirit of ’45 Day on the second Sunday in August
Source-backedFixed AnnualIn-depth guide
Spiritual Baptist Shouter Liberation Day
Trinidad and Tobago public authorities identify 30 March as Spiritual Baptist Shouter Liberation Day; the national library records that the annual holiday commemorates repeal of the prohibi…
Source-backedFixed AnnualIn-depth guide
Spoil Your Dog Day
The Animal Medical Center repeatedly lists Spoil Your Dog Day on August 10 across annual pet-awareness calendars.
Source-backedRule Based AnnualIn-depth guide
Sport Purple for Platelets Day
PDSA states that Sport Purple for Platelets Day is recognized on the last Friday of every September as part of platelet-disorder awareness work.
Source-backedRule Based AnnualIn-depth guide
Sports Day
Japan’s Act on National Holidays names Sports Day and sets it on the second Monday in October.
Source-backedRule Based AnnualIn-depth guide
Spring Astronomy Day
The Astronomical League lists Spring Astronomy Day on 25 April 2026 and describes the spring observance as a Saturday between mid-April and mid-May near or before the first-quarter Moon.
Source-backedFixed AnnualIn-depth guide
Squirrel Appreciation Day
Smithsonian continuity and National Wildlife Federation reporting support January 21, 2001 creator lineage for Christy Hargrove; current federal wildlife guidance governs safe activities.
Source-backedFixed AnnualIn-depth guide
Sretenje — Serbian Statehood Day
The Serbian Government identifies 15 February as Serbian Statehood Day (Sretenje), commemorating the 1804 uprising and 1835 constitution.
Source-backedFixed AnnualIn-depth guide
St John’s Day
St John International identifies June 24 as St John’s Day, the feast day of St John the Baptist and a special date in the worldwide Order of St John calendar.
Source-backedFixed AnnualIn-depth guide
St Joseph's Day Venezuela
National Today places the Venezuela-labelled observance on March 19 annually, while Vatican News independently confirms March 19 as the Catholic Solemnity of Saint Joseph.
Source-backedFixed AnnualIn-depth guide
St Patrick's Day
Government of Ireland material identifies 17 March as St Patrick’s Day and Ireland’s national holiday; the Workplace Relations Commission lists it among current public holidays, while the I…
Source-backedFixed AnnualIn-depth guide
St Piran’s Day / Gool Peran
Cornwall Council explicitly marks St Piran’s Day on March 5 as a celebration of Cornish culture, while UK government material identifies St Piran as Cornwall’s patron saint and traces the m…
Source-backedFixed AnnualIn-depth guide
St. Stephen’s Day
Irish statutory sources and current Workplace Relations Commission guidance establish St. Stephen’s Day as a December 26 public holiday while keeping religious tradition distinct from legal…
Source-backedFixed AnnualIn-depth guide
Star Wars Day / May the 4th
StarWars.com documents May 4 as Star Wars Day and the worldwide “May the 4th” celebration.
Source-backedFixed AnnualIn-depth guide
State Inauguration Day
Nagaland government sources identify 1 December 1963 as the formal inauguration of the State of Nagaland and continue to commemorate 1 December as Statehood Day; the State of Nagaland Act,…
Source-backedFixed AnnualIn-depth guide
State Independence Day of the Republic of Tajikistan
Tajikistan’s official legal database verifies Supreme Council Resolution No. 392 of September 9, 1991 proclaiming state independence and designating September 9 a national holiday; the acti…
Source-backedFixed AnnualIn-depth guide
Statehood Day
Slovenia’s current Holidays and Days Off Act lists 25 June as Statehood Day and a work-free holiday; government history distinguishes the 25 June 1991 adoption of the independence documents…
Source-backedFixed AnnualIn-depth guide
Statehood Day of Bosnia and Herzegovina / Dan državnosti Bosne i Hercegovine
The Presidency of Bosnia and Herzegovina marks November 25 as Statehood Day tied to the first ZAVNOBiH session in 1943. Federation government notices cite the 1995 Statehood Day law and app…
Source-backedFixed AnnualIn-depth guide
Statehood Day of Montenegro
The Government of Montenegro identifies July 13 as Statehood Day and explains the date as a symbol of Montenegrin statehood.
Source-backedFixed AnnualIn-depth guide
Stephen Foster Memorial Day
36 U.S.C. §140 authorizes annual presidential designation of January 13 as Stephen Foster Memorial Day. President Truman’s Proclamation 2957, issued December 13, 1951, designated January 13…
Source-backedFixed AnnualIn-depth guide
Stephen Lawrence Day
The Stephen Lawrence Day Foundation states that the day takes place every year on 22 April, the anniversary of Stephen Lawrence’s death, and its timeline records that Prime Minister Theresa…
Source-backedRule Based AnnualIn-depth guide
Stepmother's Day
The Capuzzi family’s creator-side account attributes the 2000 observance idea and date rule to nine-year-old Lizzie Capuzzi; a July 2000 U.S. Congressional Record statement records the fami…
Source-backedFixed AnnualIn-depth guide
Stonewall Uprising anniversary
The National Park Service states that the Stonewall uprising began in the early hours of 28 June 1969 and continued for several nights.
Source-backedRule Based AnnualIn-depth guide
Stop Food Waste Day
Compass Group first-party material verifies a 2017 U.S. launch, the first edition on 28 April 2017, global expansion in 2018 and the current annual rule of the last Wednesday in April.
Source-backedFixed AnnualIn-depth guide
Sudan Independence Day
Sudan’s official government portal announced 1 January 2026 as a nationwide official holiday for the 70th anniversary of the declaration of independence.
Source-backedRule Based AnnualIn-depth guide
Summer Bank Holiday (England and Wales)
GOV.UK
Source-backedEdition SpecificIn-depth guide
Superman Day
DC and Warner Bros. Discovery’s official 2026 material identifies April 18 as Superman Day, links the date to Superman’s Action Comics #1 debut, and describes a global fan celebration. Revi…
Source-backedFixed AnnualIn-depth guide
Supermarket Employee Day
FMI states that February 22 is Supermarket Employee Day and that the 2026 observance marked the fifth year of the industry recognition event.
Source-backedRule Based AnnualIn-depth guide
Supply Chain Professionals Day
CSCMP’s press archive and contemporaneous trade coverage establish the April 9, 2018 launch, inaugural May 21, 2018 observance and third-Monday-in-May recurrence.
Source-backedFixed AnnualIn-depth guide
Sustainable Gastronomy Day
A/RES/71/246
Source-backedFixed AnnualIn-depth guide
Sverigefinnarnas dag
Sweden’s Institute for Language and Folklore states that Sverigefinnarnas dag has been celebrated since 2011 on 24 February, the birthday of Carl Axel Gottlund, and connects it with the Swe…
Source-backedRule Based AnnualIn-depth guide
Sweetest Day
Hallmark states that Sweetest Day is always observed on the third Saturday in October and gives October 17 for 2026.
Source-backedFixed AnnualIn-depth guide
Swiss National Day
Swiss federal sources place the modern August 1 national-day tradition in the late nineteenth century, with an 1891 jubilee and later Federal Council action, and record nationwide public-ho…
Source-backedFixed AnnualIn-depth guide
Swithun, Bishop of Winchester
The Church of England calendar lists Swithun, Bishop of Winchester, on 15 July.
Source-backedFixed AnnualIn-depth guide
Synaxis of the Most Holy Mother of God
OCA’s saints calendar states that the Synaxis of the Most Holy Mother of God is commemorated on 26 December.
Source-backedFixed AnnualIn-depth guide
Sámi National Day
Norwegian government sources identify 6 February as Sámi National Day; Norway also recognizes it as an official flag day, with the date recalling the first Sámi congress in Trondheim in 191…
Source-backedFixed AnnualIn-depth guide
Taekwondo Day
World Taekwondo and the Taekwondo Promotion Foundation identify September 4 as Taekwondo Day, designated by the World Taekwondo General Assembly on July 25, 2006 to commemorate the IOC’s Se…
Source-backedRule Based AnnualIn-depth guide
Tag der deutschen Sprache (German Language Day)
Verein Deutsche Sprache (VDS) states that it launched Tag der deutschen Sprache in 2001 and that the action day is held on the second Saturday in September.
Source-backedFixed AnnualIn-depth guide
Tag der Kinderhospizarbeit (Children’s Hospice Day)
Deutscher Kinderhospizverein (DKHV) states that it launched Tag der Kinderhospizarbeit on 10 February 2006 and that the nationwide action day has been held annually on February 10 since the…
Source-backedRule Based AnnualIn-depth guide
Tag des Deutschen Butterbrotes (German Butterbrot Day)
WDR documents that the CMA established the last Friday in September as Tag des Deutschen Butterbrotes in 1999 and that the observance continued after the CMA ceased to exist in 2009.
Source-backedRule Based AnnualIn-depth guide
Take a Child to Work Day and Beyond
Junior Achievement is the current steward after completing acquisition in 2024 and rebranding the 1993 event lineage as Take a Child to Work Day and Beyond for 2025; Ms. Foundation sources…
Source-backedRule Based AnnualIn-depth guide
Take Your Cat To Work Day®
Pet Sitters International says it created Take Your Cat To Work Day and its 2026 calendar places it on Monday, June 22, opening Take Your Pet To Work Week, which ends with Take Your Dog To…
Source-backedFixed AnnualIn-depth guide
Take Your Houseplants for a Walk Day
Wellcat’s creator biography explicitly names Take Your Houseplants For A Walk Day among Tom Roy’s created holidays and the Wellcat calendar lists July 27; Community College of Denver indepe…
Source-backedFixed AnnualIn-depth guide
Take Your Webmaster to Lunch Day
The first-party Wellcat Holidays calendar lists Take Your Webmaster to Lunch Day on July 6 and identifies the Wellcat Holidays collection as created by Thomas and Ruth Roy. The project trea…
Source-backedFixed AnnualIn-depth guide
Talk Like Shakespeare Day
Illinois Register proclamation text records that Chicago Shakespeare Theater created Talk Like Shakespeare Day on Shakespeare’s birthday, April 23, and had marked it for several years.
Source-backedVariable CustomIn-depth guide
Tanabata (Star Festival)
Japan Tourism Agency and National Diet Library material verify Tanabata as a traditional seventh-day/seventh-month festival with early Japanese court history; JNTO and government cultural m…
Source-backedFixed AnnualIn-depth guide
Tanzania Independence Day
Tanzanian official history identifies 9 December 1961 as Tanganyika’s independence date, while the current Public Holidays Act lists 9 December as Independence and Republic Day.
Source-backedFixed AnnualIn-depth guide
Tartan Day
Nova Scotia traces Canada’s first Tartan Day to a 1987 provincial proclamation requested by the Federation of Scottish Culture in Nova Scotia; the Government of Canada declared April 6 Tart…
Source-backedFixed AnnualIn-depth guide
Tatiana Day / Russian Students Day
Presidential Decree No. 76 of 25 January 2005 established the Day of Russian Students on 25 January; Moscow State University materials document the older Tatiana Day/student tradition and t…
Source-backedFixed AnnualIn-depth guide
Teachers’ and Mentors’ Day
Uzbek government sources identify 1 October as Teachers’ and Mentors’ Day, established as a national holiday and day off in the 1990s.
Source-backedFixed AnnualIn-depth guide
Territory Day
Northern Territory Government sources state that Territory Day is celebrated every 1 July to recognize the commencement of self-government in 1978; Commonwealth legislation independently co…
Source-backedRule Based AnnualIn-depth guide
Terry Fox Day
Legislative Assembly / Laws of Manitoba