September 15, 2026, is the 258th day of the year, with 107 days remaining, and it falls on a Tuesday, still within the thirty-eighth week of the year.
With 20 national and international days on the calendar, September 15 is a big one. National IT Professionals Day was launched in 2015 by software company SolarWinds, recognizing the often invisible work of IT staff who keep networks and systems running. International Dot Day began in 2009 when Iowa teacher Terry Shay introduced Peter H. Reynolds’ book The Dot to his students, and has since grown into a global movement reaching millions across more than 190 countries.
World Afro Day was founded in 2017 by British news producer Michelle De Leon, growing out of a UK Parliament debate on hair discrimination in schools. And National Double Cheeseburger Day honors an American classic often credited to Bob’s Big Boy in 1937.
National Days on September 15
All national & international days celebrated today
20 celebrations on this day Day 258 of 365 · 107 days left · week 38 · Virgo season · 🌒 waxing crescentNational IT Professionals Day
Launched in 2015 by software company SolarWinds, recognizing the often invisible work of IT staff who keep networks, systems, and cybersecurity running.
International Dot Day
Began in 2009 when Iowa teacher Terry Shay introduced Peter H. Reynolds’ book The Dot to his students, and has since grown into a global movement across more than 190 countries.
World Afro Day
Founded in 2017 by British news producer Michelle De Leon, growing out of a UK Parliament debate on hair discrimination in schools to celebrate Afro hair and identity.
National Double Cheeseburger Day
Honors an American classic often credited to Bob’s Big Boy in 1937, whose version added a middle bun slice that became a defining feature.
Here’s every observance celebrated on September 15, 2026.
National & International Days on September 15
Here’s a closer look at the 20 national and international days celebrated on September 15.
Butterscotch Cinnamon Pie Day
Butterscotch Cinnamon Pie Day is a sweet tribute to a fictional dessert from the 2015 indie video game Undertale, created by Toby Fox. In the game, the character Toriel bakes a butterscotch cinnamon pie for the player, symbolizing comfort and kindness. The pie became iconic within the fandom, inspiring fans to bake real-life versions. The observance highlights the unique way storytelling in modern media can inspire traditions that extend beyond the screen into real-world culture.
Get Ready Day
Get Ready Day* (Third Tuesday in September) was launched in 2006 by the American Public Health Association as part of its “Get Ready” campaign. The day highlights the importance of emergency preparedness—whether for pandemics, natural disasters, or other crises. Families and communities are encouraged to make emergency kits, create communication plans, and review safety procedures. The observance underscores how small, proactive steps can make a critical difference during emergencies.
Greenpeace Day
Greenpeace Day was established in 2011 by Vancouver Mayor Gregor Robertson to mark September 15, 1971, when 17 activists sailed from Vancouver aboard the Phyllis Cormack to protest U.S. nuclear testing on Amchitka Island, Alaska. This voyage marked the beginning of Greenpeace, which has since become one of the world’s largest and most influential environmental movements. The day honors the power of grassroots activism, reminding us how small, determined groups can grow into global forces for ecological protection and peace.
International Day of Democracy
International Day of Democracy was created by the United Nations General Assembly in 2007 to promote democratic values worldwide and strengthen participation in civic life. The date recalls the 1997 Universal Declaration on Democracy, adopted by the Inter-Parliamentary Union, which defined democracy as a universal value rooted in freedom, equality, and respect for human rights. The day is an opportunity to reflect on democratic progress and challenges, encouraging societies to uphold accountability, transparency, and inclusiveness in governance.
International Dot Day
International Dot Day began in 2009 when Iowa teacher Terry Shay introduced Peter H. Reynolds’ book The Dot (2003) to his students. The book tells the story of Vashti, a child who discovers her creative potential by making a single dot, which becomes the beginning of her artistic journey. Shay’s classroom celebration inspired what is now a global movement involving millions of participants in over 190 countries. Dot Day encourages creativity, collaboration, and the belief that even the smallest mark can spark big change.
Make a Hat Day
Make a Hat Day invites people to explore self-expression and imagination by crafting and wearing hats. While its exact origins are unclear, it likely emerged in the early 2000s as a grassroots celebration of creativity. Hats have played important roles in human societies for thousands of years, from ceremonial crowns and military helmets to fashion statements and protective gear. This day honors that long cultural history while encouraging everyone, regardless of skill, to design something fun and personal.
National Cheese Toast Day
National Cheese Toast Day was founded in 2015 by Sizzler restaurants to honor their signature side dish, first introduced in 1958 by founder Del Johnson. Cheese on toast, however, has a much longer lineage, with dishes like Welsh Rarebit documented in 18th-century Britain. Sizzler’s buttery garlic cheese toast became a hallmark of the chain and is still fondly remembered by generations of diners.
National Crème de Menthe Day
National Crème de Menthe Day commemorates the mint-flavored liqueur created in 1885 by French pharmacist Emile Giffard. Originally devised as a medicinal digestif, it quickly found popularity as a refreshing beverage and cocktail ingredient. Its distinctive green version became especially iconic in drinks such as the Grasshopper. The observance not only highlights a popular spirit but also recalls a time when pharmacists often doubled as inventors of remedies and liqueurs, blending science with culinary craft.
National Custom Framing Day
National Custom Framing Day was established in 2021 by Roma Moulding, an Italian company recognized for its eco-conscious approach to frame-making. Observed annually on September 15, the day shines a spotlight on custom framers—artisans whose skill preserves and enhances artwork, photographs, and treasured keepsakes. Framing protects pieces from damage, complements their aesthetic, and helps tell personal stories through presentation. The observance encourages people to see framing not just as decoration but as an art form in itself.
National Day of the Cowgirl
National Day of the Cowgirl falls on September 15 each year, created in 2022 by Durango Boots to honor the strength and resilience of the American cowgirl. It celebrates women who embody the cowgirl spirit, from ranchers and rodeo athletes to those who simply share a passion for Western culture. The day also comes with a Durango-sponsored scholarship for young women pursuing degrees in agriculture, ranching, or equine studies.
National Double Cheeseburger Day
National Double Cheeseburger Day honors an American classic that layers flavor and indulgence with two patties and extra cheese. The invention is often credited to Bob’s Big Boy in 1937, whose version added a middle bun slice for stability and presentation. Over time, the double cheeseburger became a staple of fast food and diner culture, embodying the spirit of hearty, casual dining. The day celebrates not only the dish itself but also its role in shaping 20th-century American food traditions.
🍔 A similar day, National Cheeseburger Day, is celebrated on September 18.
National Felt Hat Day
National Felt Hat Day marks the traditional seasonal shift when people put away straw hats of summer and bring out warmer felt hats for autumn. Felt hats have a history stretching back thousands of years, serving practical purposes such as warmth and protection while also functioning as symbols of style, class, and profession.
National Google.com Day
National Google.com Day commemorates September 15, 1997, when Larry Page and Sergey Brin registered the domain name google.com. Derived from a misspelling of “googol,” the name symbolized the company’s ambition to organize immense quantities of information. Just one year later, Google officially incorporated, eventually becoming the world’s dominant search engine.
National IT Professionals Day
National IT Professionals Day* (Third Tuesday in September) was launched in 2015 by SolarWinds, a software company, to recognize the essential but often invisible work of IT staff. From network management to cybersecurity, IT professionals keep modern organizations running smoothly. The day encourages businesses and individuals to appreciate their technical experts, who often solve problems behind the scenes. It also promotes awareness of IT as a vital and evolving field in the digital age.
National Linguine Day
National Linguine Day celebrates the pasta that originated in the Liguria region of Italy, with roots dating to the 16th century in Genoa. The word “linguine” means “little tongues,” describing its flat, narrow shape, wider than spaghetti but slimmer than fettuccine. Its design makes it ideal for pairing with sauces such as pesto, a Ligurian specialty, or seafood blends common along Italy’s coastline. Popularized worldwide, linguine embodies the enduring global influence of Italian cuisine and culinary tradition.
National Neonatal Nurses Day
National Neonatal Nurses Day falls on September 15 each year, observed within National Neonatal Nurses Week from September 12 to 18, as well as National Neonatal Intensive Care Awareness Month. It honors nurses who care for fragile newborns, including premature babies and infants with birth defects, infections, or heart problems. The National Association of Neonatal Nurses established the day in 2000 to recognize this specialty and the care these nurses provide to protect the most vulnerable infants.
National Online Learning Day
National Online Learning Day was launched in 2016 to highlight the rapid growth of digital education and its transformative impact. Online platforms provide flexible, accessible, and innovative opportunities for learners who might otherwise be limited by geography, finances, or personal schedules. The observance honors students, educators, and institutions pioneering new methods of teaching and learning, while also encouraging society to embrace the future of education in a connected world.
National Tackle Kids Cancer Day
National Tackle Kids Cancer Day is observed every September 15 and raises awareness and funds for pediatric cancer research. It grew out of Tackle Kids Cancer, a Hackensack Meridian Health initiative started in 2015 with the New York Giants, and it supports programs at the Children’s Cancer Institute at Hackensack University Medical Center. The day encourages communities and football fans nationwide to volunteer and donate, since only a small share of federal cancer funding goes toward childhood cancer research.
National Voter Registration Day
National Voter Registration Day* (Third Tuesday in September) was first organized in 2012 by the National Association of Secretaries of State. The observance encourages eligible U.S. citizens to register to vote and reminds them to keep their information current. Celebrated with nonpartisan drives across all 50 states, the day highlights the role of voter registration in ensuring broad participation in democracy.
World Afro Day
World Afro Day was founded in 2017 by Michelle De Leon, a British news features producer, to celebrate Afro hair and culture while challenging discrimination. The observance grew out of a UK Parliament debate on hair acceptance in schools, a landmark in fighting institutional bias. Through workshops, education programs, and global media campaigns, World Afro Day promotes pride in natural hairstyles, dismantles harmful stereotypes, and recognizes Afro hair as an integral expression of identity and heritage.
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National Days in September
