Below is a small sampling of some Diversity Calendar 2025 events. To enjoy all 100+ events and educational tools, subscribe to our Diversity Calendar.
Need a Diversity Calendar for 2025? Get complete DEI and inclusion events, religious observances, awareness months 2025, and more
In 2025, the importance of diversity, equity, and inclusion continues to be a central theme in our global conversation. While we have made strides in creating more inclusive environments, there is always room for growth and improvement. A truly thriving society depends on recognizing and celebrating our differences.
Organizations are increasingly focused on developing DEI initiatives that ensure every employee feels valued and included. One effective tool to support these efforts is our Diversity Calendar, which highlights DEI holidays and significant cultural events throughout the year. This calendar serves as a reminder of the importance of inclusion in our daily lives and workplaces.
Below, you’ll find a sample of our diversity and inclusion calendar for 2025, featuring religious holidays, awareness months, and monthly diversity themes. This selection is designed to help you celebrate and integrate these important dates into your personal and professional life.
If a holiday begins the evening before, we will mark it with an asterisk (*) below.
January is a month to celebrate the diverse ways in which we communicate and connect with each other. From recognizing the importance of Braille for the visually impaired to honoring cultural and religious celebrations, this month is about understanding and appreciating the various forms of expression that enrich our world.
January 4 – UN: World Braille Day Celebrates the importance of Braille for the visually impaired.
January 7 – Coptic & Eastern Orthodox Christian: Christmas Marks the birth of Jesus Christ according to the Julian calendar.
January 14 – Buddhist: Mahayana New Year Celebrates the Buddhist New Year in Mahayana traditions.
January 20 – Martin Luther King Jr. Day Honors the civil rights leader and his contributions to equality.
January 27 – International Day of Commemoration in Memory of Victims of the Holocaust Remembers the victims of the Holocaust and promotes Holocaust education.
Learn more about January diversity days with our web-based DEI Calendar suite. Make sure to also check out our Heritage Months 2025highlights.
February is dedicated to celebrating Black History Month, a time to honor the contributions, achievements, and rich history of Black Americans. This month also includes significant events that promote harmony and awareness across various cultural and health-related spectrums.
February 1 – UN: World Interfaith Harmony Week Promotes harmony between all people regardless of their faith.
February 2 – Pagan and Wiccan: Imbolc Celebrates the beginning of spring and the goddess Brigid.
February 4 – World Cancer Day Raises awareness of cancer prevention, detection, and treatment.
February 17 – Washington’s Birthday (Presidents’ Day) Honors the birthday of George Washington, the first U.S. President.
February 26 – Hindu: Maha Shivaratri A major Hindu festival celebrating Lord Shiva.
March is dedicated to celebrating Women’s History Month, a time to recognize the contributions and achievements of women throughout history. This month also features important observances across different faiths and cultures, emphasizing the importance of equality and diversity.
April is dedicated to World Autism Month, raising awareness and promoting understanding and acceptance of people with autism. This month also includes diverse religious and cultural celebrations, highlighting the rich tapestry of global traditions.
May is Mental Health Awareness Month, a time to promote mental well-being and reduce the stigma surrounding mental health issues. This month also includes events that recognize diverse cultural, religious, and social contributions to our global community.
June is LGBTQ+ Pride Month, celebrating the diversity, history, and contributions of the LGBTQ+ community. This month also includes events emphasizing love, acceptance, and the importance of countering hate speech.
July is Disability Pride Month, celebrating the achievements and contributions of people with disabilities. This month also includes significant cultural and national observances that promote equality and inclusion.
August is Intersectionality Awareness Month, highlighting the interconnected nature of social categorizations such as race, class, and gender. This month features events that promote understanding and advocacy for diverse and intersecting identities.
September celebrates Hispanic Heritage Month, recognizing the contributions and influence of Hispanic Americans to the history, culture, and achievements of the United States. This month also includes observances that promote mental health, safety, and equality.
October is Breast Cancer Awareness Month, dedicated to raising awareness and promoting research for breast cancer. This month also features diverse cultural and religious events that foster inclusion and understanding.
November is Native American Heritage Month, celebrating the cultures, traditions, and histories of Native Americans. This month also includes observances that honor veterans and promote gender equality and remembrance.
Visit here to read more about November diversity days with our November Diversity Calendar 2025.
December Diversity Calendar 2025
December is Universal Human Rights Month, promoting the protection and advocacy of human rights for all. This month also includes diverse religious and cultural celebrations that encourage unity and peace.
Discover even more insightful and interesting diversity days that you can celebrate during December with our Diversity Calendar Suite. You can also explore more inclusion opportunities with our Interfaith Calendar 2025.
We hope you’ve found this Diversity Calendar 2025 Highlights useful in your quest for DEI and learning more about DEI holidays 2025. Try out the full Online Diversity Calendar for all 1,000+ DEI events, religious holidays, and observances.
Discover the prolific career of 18th-century Swiss mathematician Leonhard Euler, whose work spanned almost every field of math under the sun!
By Lillie Therieau
Leonhard Euler was a hardworking man, publishing hundreds of papers and articles throughout his career. The 18th-century Swiss mathematician shaped several disciplines of mathematics and physics, making critical contributions that paved the way for his predecessors.
When he went totally blind in middle age, Leonhard’s productivity only increased. He liked to quip that eyesight had been his last remaining distraction from his work! Learn more about Leonhard’s life as a mathematician and his struggles to navigate the political upheaval of 18th-century Russia.
Leonhard Euler’s Driven Life
Leonhard Euler was born in Basel, Switzerland in 1707. His father was a pastor and his mother was a pastor’s daughter, both of the Protestant reformed church. Soon after his birth, the Euler family moved to the town of Riehen, where Leonhard’s father became a pastor at the local church. Leonhard spent most of his childhood in Riehen, spending lots of time with the Bernoulli family, who were friends of his father. As a young child, he took classes from Jacob Bernoulli, who was regarded as one of the most famous European mathematicians at the time.
However, when it came time for Leonhard to begin his formal education, he moved back to Basel to live with his maternal grandmother. When he was 13 years old, he enrolled at the University of Basel. While taking his university classes, he was also receiving private tutoring on the weekends with Johann Bernoulli. Johann discovered Leonhard’s innate talent for mathematics and helped to convince his father to allow him to study mathematics, instead of theology.
At the age of 19, Leonhard completed his dissertation on the mathematical properties of sound. He unsuccessfully tried to get a position at the University of Basel, like many of his friends in the Bernoulli family. However, he was offered a position at the Imperial Russian Academy of Sciences by Daniel Bernoulli, after his brother Nicolaus died, leaving an open professorship. Leonhard quickly learned Russian and adjusted to life in St. Petersburg. He also became a medic in the Russian Navy. When Emperor Peter the Great died, conditions deteriorated at the Academy. He had established the school to modernize Russia and bring it into line with the rapid scientific progress being made in Western Europe. However, Peter the Great’s successors were much more conservative, censoring the professors at the school and displaying general hostility towards the foreigners that held positions there.
In 1731, Leonhard was promoted to Professor of Physics. Just a few years later, he ascended to the head of the mathematics department after his friend Daniel quit and returned to Switzerland. In 1934, Leonhard married Katharina Gsell, the daughter of a well-known Russian painter.
Just a few years later, the Prussian Emperor offered Leonhard a position at his new Berlin Academy. He initially resisted leaving Russia, trying to eke out an academic career amidst political upheaval. By 1741, however, another Russian emperor died, leaving a power vacuum. Leonhard decided to leave and travel to Prussia. Leonhard and his family moved to Berlin, where he would stay for the next 25 years.
In Berlin, Leonhard was given the freedom to publish on whatever topics he wished. During his tenure, he published several hundred papers! However, he was frequently the object of the Prussian Emperor’s scorn. Frederick the Great enjoyed surrounding himself with sophisticated, worldly intellectuals who often leaned towards the secular. Leonhard himself was deeply religious and largely unconcerned with subjects outside of the realm of mathematics and science.
When it came time to appoint the new president of the Berlin Academy, Leonhard was passed over, despite his vast contributions to the academic influence of the academy. Instead, Frederick the Great installed himself as president. Despite the many improved conditions in Prussia, Leonhard missed Russia and stayed in contact with his friends and colleagues there. He even published over 100 papers in Russia, all while employed at the Berlin Academy, a real feat at the time.
In 1766, when Catherine the Great took the Russian throne, the empire stabilized. More in line with Peter the Great’s policies on mathematics and academics, Leonhard felt that he could return to Catherine’s Russia. He accepted another position at the St. Petersburg Academy and returned with his family that same year.
In the meantime, Leonhard’s eyesight was deteriorating. By 1766 he’d already lost most of the sight in his right eye and cataracts were discovered in the left one. A failed surgery in Russia rendered him almost totally blind. Surprisingly, this did not limit his productivity! With the help of assistants who transcribed his work, he published even more than he had before he lost his eyesight.
Leonhard Euler’s Profound Impact on Math
Leonhard made countless discoveries in the field of mathematics, working with calculus, geometry, number theory, trigonometry, and many areas of physics. He is most notable for creating the function, which assigns every number in set x exactly one number in set y. It is a fundamental building block of algebraic thinking today and you may recognize it as f(x) = y. He also popularized the use of the symbol π!
He expanded on the work his friends in the Bernoulli family had done concerning the new field of infinitesimal calculus. He developed and popularized the power series, which allows for the expression of functions as sums of infinitely many terms. This aided him in advanced calculus analysis, pushing at the previous limitations of the field.
Leonhard was also known for applying his geometry and trigonometry know-how to mechanical engineering and astronomy. He was able to calculate the orbits of planets and other celestial bodies with amazing accuracy, and he laid the groundwork for the wave theory of light with his papers on optics. Finally, Leonhard was interested in the unusual application of mathematics to music composition. He saw music theory as a profoundly mathematical discipline and he believed that a more granular mathematical approach could benefit future composers. However, many saw his music theory work as too mathematical for musicians to make use of.
Euler’s table of the first ten degrees of agreeableness of musical intervals, via thatsmaths.com
Leonhard Euler’s Sudden Death and Lasting Legacy
In 1783, Leonhard was having a leisurely lunch with his family, discussing the recent discovery of the planet Uranus. Suddenly, he dropped to the ground, dead. He had suffered a massive and unexpected aneurysm. He was eulogized all over Europe by notable mathematicians and scientists.
Leonhard Euler’s role as a lifelong teacher impacted the education of thousands of students in Prussia and Russia, many of whom went on to become important forces of progress in mathematics. His work paved the way for future developments in physics and calculus, most notably.
He’s been featured on several Swiss banknotes, as well as Swiss and Russian postage. An asteroid found by a Russian astronomer in 1973 was named 2002 Euler, and Leonhard’s grave is now the spot of a large commemorative statue.
The Brilliant Lives of Famous Mathematicians
This article is the fifteenth in our series exploring the lives and achievements of famous mathematicians throughout history. (Our last article was about the Scottish mathematician John Napier!)
Through the lives of these brilliant folks, we hope you’ll find connections, inspiration, and empowerment.
Recent Blogs posted from our team
Why Your Child Is Behind in Math (Yes, Even Your Child)
Elephant Learning accurately tests and evaluates kids at different grade levels to see if they truly get what they should be learning. It then adjusts what they’re learning to ensure they understand math conceptually right from the start. The app provides educational games for the kids while also providing parents with reports and information on how the app is actually teaching a concept. Parents will find games to play with their children outside of the app that further support learning. We break it down for you, telling you how to help your child along every step of the way and showing you how to identify your child’s misunderstandings simply. For instance, rather than correcting them or showing them how to do the math problem correctly, ask them why they think they’re correct; you’re going to see what they misunderstand nearly immediately and be able to give them a hint on how to overcome it. This way, Elephant Learning is empowering to the student, but it’s also empowering to the parent. You no longer have to be afraid to take your child’s math education into your own hands.
Read More
Why You Need Tools Other Than Math Worksheets to Help Your Kid Become a Math Whiz
Discover why math worksheets aren’t the best tool for helping your child ace math.
Read More
Why Math Tutoring Doesn't Help
Discover why math tutoring is not the most effective tool for helping your student learn math.
