A national observance on March 21 recognizing the dedication, sacrifices, and child-rearing efforts of unmarried, widowed, or divorced parents.

An annual observance on March 21 celebrating the crunchy taco, a fried corn tortilla shell filled with seasoned meat, lettuce, cheese, and other toppings.

A food observance on the first Saturday of March Madness celebrating corn dogs, tater tots, American beer, and the NCAA Men's Division I Basketball Championship.

A food observance on March 21 celebrating French bread, honoring its crispy crust, soft interior, and central role in French culinary culture.

An awareness observance on March 21 raising global awareness of Down syndrome, promoting inclusion, human rights, and full participation of people with Down syndrome in society.

An international fan observance on March 21 celebrating the history, characters, and traits associated with the Slytherin house from the Harry Potter series.

An awareness observance on March 21 celebrating the influence of colour on human perception, emotions, culture, science, and art through global exhibitions and workshops.

An appreciation day on March 21 celebrating teenagers, recognizing their value, achievements, and the unique challenges they face during the transition from childhood to adulthood.

An awareness observance on March 21 celebrating poetry as a form of cultural and linguistic expression, supporting linguistic diversity, oral traditions, and the convergence of poetry with other arts.

An awareness observance on March 21 celebrating human memory, raising awareness about memory loss from diseases like Alzheimer's and dementia, and promoting brain health.

A cultural observance on March 21 celebrating the artistry, history, and sensory experience of perfumes and fragrances.

A cultural observance on March 21 celebrating Australia's cultural diversity, inclusiveness, and respect, coinciding with the UN International Day for the Elimination of Racial Discrimination.

An awareness observance on March 21 dedicated to the elimination of racial discrimination worldwide, commemorating victims of the Sharpeville massacre and promoting global efforts against racism and apartheid.

A fun observance on March 21 celebrating individuals born under the Aries zodiac sign, honoring their energetic, impulsive, and pioneering traits associated with the ram symbol and fire element.

A food observance on March 21 promoting the importance and benefits of healthy fats, particularly traditional animal fats, in a balanced diet and culinary traditions.

An environmental advocacy day on March 21 celebrating the importance of all types of forests for biodiversity, climate regulation, water filtration, and providing livelihoods for current and future generations.

A fun observance on March 21 celebrating the thrill and anticipation of countdowns to important personal events and milestones such as weddings, graduations, or the end of treatments.

A fun observance on March 21 celebrating all people named Peter, honoring the name's Greek origins meaning "rock" or "stone" and its biblical significance.

A cultural observance on the third Saturday of March celebrating quiltmakers, the art and tradition of quilting, and promoting community events and preservation of quilting heritage.

A religious observance marking the Bahá'í New Year on the vernal equinox, symbolizing spiritual renewal and the arrival of spring as the first day of the Badí' calendar.

A cultural observance on March 21 celebrating the art of puppetry, honoring puppeteers, and promoting puppetry traditions, innovation, and its role in education and cultural diversity.

A cultural observance on March 21 celebrating the Planck mission's cosmic microwave background map and the scientific evidence confirming the Big Bang theory and the universe's age of approximately 13.8 billion years.

An environmental advocacy day on March 21 promoting awareness of renewable energy sources such as solar, wind, and hydropower to combat fossil fuel overuse and support a sustainable future.

A cultural observance on March 21 honoring mothers for their love, sacrifices, and devotion to their families.

A heritage observance on March 21 commemorating Namibia's independence from South Africa achieved on March 21, 1990, following UN-supervised elections.

A fun observance on March 21 promoting common courtesy, politeness, respect, and small acts of kindness in daily interactions.

A cultural observance on the vernal equinox celebrating the Persian New Year, the beginning of spring, renewal, and the Zoroastrian tradition of the triumph of good over evil.

A cultural observance on March 21 celebrating the launch of Twitter and the first tweet, marking the platform's role in real-time communication and global public discourse.

A sporting event in March promoting active journeys to school by walking, wheeling, scooting, and cycling through an inter-school competition to encourage healthier lifestyles and sustainable travel habits.

A food observance on March 21 celebrating vermouth, a fortified and aromatized wine infused with botanicals, for its history, versatility in cocktails, and social enjoyment.

A heritage observance on March 21 honoring solidarity with Afghan resistance against Soviet invasion and occupation, coinciding with the Afghan New Year (Nowruz).

A cultural observance on the spring equinox celebrating the Persian New Year and the first day of spring, marking renewal of nature with rituals promoting peace, solidarity, reconciliation, and cultural diversity among over 300 million people.

A fun observance on March 21 celebrating people named Beverly, honoring the name's Old English origin meaning "beaver meadow" and its connection to nature.

An awareness observance on March 21 promoting positive race relations, celebrating ethnic diversity, and working toward the elimination of racial discrimination and prejudice.

A cultural observance on March 21 informally listed as a youth empowerment day on some calendar sites.

An awareness observance on March 21 promoting the reduction of credit card debt and responsible credit card usage to achieve financial freedom.