2019
Later action
National Concussion Awareness Day®
Supported designation of September 20, 2019 as National Concussion Awareness Day for that edition; it did not create a permanent federal holiday or permanent statutory recurrence.
Evergreen date guide
What is celebrated on September 26?
See the observances and verified observance-history milestones attached to September 26. Each observance keeps its own source and date details.
Verified history
Today in history →On this date in observance history
Selected observance milestones connected to this date, based on reviewed sources.
2014
First observance
International Day for the Total Elimination of Nuclear Weapons
United Nations observance material states that the International Day was observed for the first time in September 2014.
2013
Precursor
International Day for the Total Elimination of Nuclear Weapons
The first high-level meeting supplied the direct institutional context for the follow-up resolution; at the meeting, 26 September was proposed as the annual international day, and…
2001
First observance
European Day of Languages
Council of Europe records state that the first European Day of Languages took place on 26 September 2001.
1993
Later action
Swiss National Day
Approved nationwide work-free public-holiday status for August 1; federal history records the public-holiday status from 1994.
1974
Institutional decision
Día de la Soberanía Nacional (National Sovereignty Day)
The official legal database gives both sanction and publication dates.
Reviewed depth
Other in-depth guides on September 26
Source-backedFixed AnnualIn-depth guide
European Day of Languages
Council of Europe records establish the first 26 September 2001 edition and the Committee of Ministers decision of 6 December 2001 making the day annual.
Source-backedRule Based AnnualIn-depth guide
Fish Amnesty Day
PETA states that it created Fish Amnesty Day in 1997 and marks it on the fourth Saturday in September.
Source-backedFixed AnnualIn-depth guide
HR Professionals Day
Hofstra University and employer professional communications identify September 26 as HR/Human Resource Professional Day.
Source-backedFixed AnnualIn-depth guide
International Day for the Total Elimination of Nuclear Weapons
A/RES/68/32
Source-backedRule Based AnnualIn-depth guide
International Rabbit Day
World Animal Protection describes International Rabbit Day as occurring on the fourth Saturday of September and gives 26 September for 2026.
Source-backedFixed AnnualIn-depth guide
Mesothelioma Awareness Day
The Mesothelioma Applied Research Foundation states that Mesothelioma Awareness Day takes place annually on September 26 and was established by its community in 2004.
Explore the mix
All topics →Topics represented on September 26
14 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
European Day of Languages
Council of Europe records establish the first 26 September 2001 edition and the Committee of Ministers decision of 6 December 2001 making the day annual.
Source-backedRule Based AnnualIn-depth guide
Fish Amnesty Day
PETA states that it created Fish Amnesty Day in 1997 and marks it on the fourth Saturday in September.
Source-backedFixed AnnualIn-depth guide
HR Professionals Day
Hofstra University and employer professional communications identify September 26 as HR/Human Resource Professional Day.
Source-backedFixed AnnualIn-depth guide
International Day for the Total Elimination of Nuclear Weapons
A/RES/68/32
Source-backedRule Based AnnualIn-depth guide
International Rabbit Day
World Animal Protection describes International Rabbit Day as occurring on the fourth Saturday of September and gives 26 September for 2026.
Source-backedFixed AnnualIn-depth guide
Mesothelioma Awareness Day
The Mesothelioma Applied Research Foundation states that Mesothelioma Awareness Day takes place annually on September 26 and was established by its community in 2004.
Source-backedFixed AnnualIn-depth guide
National Dumpling Day
National Day Calendar records September 26 as National Dumpling Day and says TMI Food Group submitted the observance in 2015.
Source-backedRule Based AnnualIn-depth guide
National Ghost Hunting Day
The official National Ghost Hunting Day site states the event was established in 2016 and is held on the last Saturday of September.
Source-backedRule Based AnnualIn-depth guide
National Hunting and Fishing Day
U.S. Fish & Wildlife Service states Congress established the observance in 1972 and it is celebrated on the fourth Saturday in September
Source-backedFixed AnnualIn-depth guide
National Law Enforcement Suicide Awareness Day
FBI outreach material identifies September 26 as National Law Enforcement Suicide Awareness Day; Blue H.E.L.P. states the day was created to remember officers lost to suicide and reduce sti…
Source-backedRule Based AnnualIn-depth guide
National Public Lands Day
National Park Service current 2026 observance page; led by NEEF in partnership with NPS and federal agencies
Source-backedEdition SpecificIn-depth guide
National Seat Check Saturday
NHTSA identifies National Seat Check Saturday as the closing Saturday of Child Passenger Safety Week. The agency lists September 26 for 2026 and different dates in other editions, so the da…
Source-backedFixed AnnualIn-depth guide
National Situational Awareness Day
Pretty Loaded states that it submitted National Situational Awareness Day in 2015 and continues to mark September 26 annually. National Day Calendar records the 2015 submission/declaration…
Source-backedRule Based AnnualIn-depth guide
Save Your Photos Day
The Photo Managers states it has led the Save Your Photos effort since 2014; founder Cathi Nelson describes Save Your Photos Day as the original last-Saturday-in-September format before exp…
How dates are selected
This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.
Read the methodology →