• National Guacamole Day

    United States , United States

    National Guacamole Day is celebrated every year on 16 September. In 2026 it falls on Wednesday, 16 September. The day honours the much-loved avocado dip with deep roots in Mexican...

  • National School Backpack Awareness Day

    United States , United States

    National School Backpack Awareness Day is held on the third Wednesday of September each year, falling on Wednesday, 16 September 2026. Organised by the American Occupational Therapy Association (AOTA), the...

  • National Uniform Day

    United States , United States

    National Uniform Day is observed in the United States on the third Wednesday of September, falling on Wednesday, 16 September 2026. The day recognises the tens of millions of people...

  • National Sit With a Stranger Day

    United States , United States

    National Sit With a Stranger Day takes place on Wednesday, 16 September 2026. The day encourages people to set aside their usual routine, sit beside someone they do not know,...

  • Orchid Male Cancer Awareness Week 2026

    United Kingdom , United Kingdom

    Orchid Male Cancer Awareness Week is an annual campaign dedicated to raising awareness about male-specific cancers, including prostate, testicular, and penile cancers. Organized by the charity Orchid, this week focuses...

  • Rheumatoid Arthritis Awareness Week 2026

    United Kingdom , United Kingdom

    Rheumatoid Arthritis Awareness Week is an annual campaign dedicated to raising awareness about rheumatoid arthritis (RA), a chronic autoimmune disease that causes inflammation, pain, and swelling in the joints. This...

  • World Mitochondrial Disease Week 2026

    International

    World Mitochondrial Disease Week is an annual global awareness event aimed at educating the public about mitochondrial diseases, a group of disorders caused by dysfunctional mitochondria. These rare, often devastating...

  • National Retinoid Week 2026

    International

    What is National Retinoid Week? Celebrated annually by skinbetter on the third week of September, National Retinoid Week focuses on educating on the demonstrated benefits of retinoids and showcasing innovations in formulations that aim...

  • Constitution Day (Citizenship Day) 2026

    United States , United States

    Constitution Day, also known as Citizenship Day, is an annual observance in the United States that commemorates the signing of the U.S. Constitution on September 17, 1787. This day is...

  • National Pet Bird Day

    United States , United States

    National Pet Bird Day takes place every year on 17 September, celebrating companion birds and the joy they bring to millions of households. Created in 2019 by the Bird Enjoyment...

  • National Professional House Cleaners Day

    United States , United States

    National Professional House Cleaners Day takes place every year on 17 September. The observance recognises the skill, effort, and professionalism of the people who clean homes for a living, and...

  • Constitution Day

    United States , United States

    Constitution Day, also known as Constitution and Citizenship Day, is observed in the United States on 17 September each year, marking the anniversary of the signing of the US Constitution...

  • World Manta Day

    International

    World Manta Day takes place every year on 17 September, raising awareness of manta and devil rays and the mounting threats they face in the world's oceans. Established by the...

  • National Arielle K. Sterrett Day

    United States , United States

    National Arielle K. Sterrett Day takes place every year on 17 September. It is a day of kindness created in memory of Arielle K. Sterrett, a teenager from Kennesaw, Georgia,...

  • National Pawpaw Day

    United States , United States

    National Pawpaw Day is celebrated on the third Thursday of September each year, putting the spotlight on North America's largest native fruit. In 2026, it falls on Thursday, 17 September....

  • National HIV/ AIDS and Ageing Awareness Day 2026

    United States , United States

    National HIV/AIDS and Aging Awareness Day is an annual observance dedicated to addressing the challenges faced by older adults living with HIV/AIDS. As medical advancements have allowed people with HIV...

  • International Equal Pay Day 2026

    International

    On September 18, 2026, communities around the world will mark International Equal Pay Day - a day dedicated to the ongoing fight for equal pay for work of equal value....

  • National POW / MIA Recognition Day 2026

    United States , United States

    National POW/MIA Recognition Day is an annual observance in the United States dedicated to honoring and remembering the sacrifices of American service members who were prisoners of war (POWs) and...

  • National Cartonnage Day

    International

    National Cartonnage Day takes place on Friday, 18 September 2026, celebrating the craft of cartonnage, the art of making fabric-covered and paper-covered boxes by hand. The day encourages crafters of...