Sustainability calendar
All awareness days on sustainability, climate, nature, ecology, society and nonprofits in one calendar. Handy for planning your content, campaigns and events.
Awareness days in September 2026
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International Day of Charity
UN day for charities and volunteering.
Nonprofits & volunteers International -
International Day of Clean Air for Blue Skies
UN day for clean air and blue skies.
Climate & energy International -
International Literacy Day
UNESCO day on reading and writing for everyone.
Social Impact International -
International Day of Democracy
UN day for democracy and citizenship.
Social Impact International -
European Mobility Week begins
A week (September 16–22) for sustainable mobility.
Climate & energy International -
International Day for the Preservation of the Ozone Layer
UN day for restoring the ozone layer.
Climate & energy International -
World Cleanup Day
Worldwide cleanup against litter.
Circularity & consumption International -
International Day of Peace
UN day for peace and nonviolence.
Social Impact International -
World Car Free Day
Leave the car at home for a day.
Climate & energy International -
World Rhino Day
Spotlight on the five rhino species.
Nature & ecology International -
Anniversary of the Sustainable Development Goals
On September 25, 2015, the UN adopted the 17 SDGs.
Social Impact International -
Neighbors Day (NL)
Oranje Fonds day to team up with your neighbors and do something for the neighborhood.
Nonprofits & volunteers Netherlands -
International Day of Awareness of Food Loss and Waste
UN day on food loss and waste.
Circularity & consumption International
Days marked approximate date are set each year by the organizer. Missing a day? Let us know.