Economic and Social Council (ECOSOC) Youth Forum
The Forum provides a platform for young people to engage in a dialogue with Member States and other actors to voice their views, concerns, and galvanize actions on how to transform the world into a fairer, greener, and more sustainable place guided by the Sustainable Development Goals (SDGs).
UNECE Regional Forum on Sustainable Development
The Regional Forum on Sustainable Development was established by the Economic Commission for Europe at its sixty-seventh session in April 2017, with the aim to create “a regional mechanism to follow-up and review the implementation of the 2030 Agenda for Sustainable Development”
International Mother Earth Day
International Mother Earth Day aims to raise global public awareness of the challenges to the well-being of the planet and all the life it supports. The Day also recognizes a collective responsibility, as called for in the 1992 Rio Declaration, to promote harmony with nature and the Earth, to achieve a just balance among the economic, social, and environmental needs of the present and future generations of humanity.
Twelfth Session of the Africa Regional Forum on Sustainable Development
The Twelfth Session of the Africa Regional Forum on Sustainable Development is scheduled to take place from 28 to 30 April 2026. This session will focus on the Sustainable Development Goals (SDGs) and will be a platform for assessing progress and exchanging knowledge, best practices, and policy solutions to support the implementation of the 2030 Agenda.
World Urban Forum (WUF13)
WUF was established in 2001 by the United Nations to examine one of the most pressing issues facing the world today: rapid urbanization and its impact on communities, cities, economies, climate change and policies. The first WUF was held in Nairobi, Kenya in 2002 and has been held around the world ever since.
Representatives of national, regional and local governments, academics, business people, community leaders, urban planners and…
International Day for Biological Diversity
As the global community is called to re-examine our relationship to the natural world, one thing is certain: despite all our technological advances we are completely dependent on healthy and vibrant ecosystems for our water, food, medicines, clothes, fuel, shelter and energy.
World Environment Day
World Environment Day, which Baku will host on 5 June 2026, is the largest global platform for environmental engagement and action. Established by the UN General Assembly in 1972, the Day inspires and is celebrated by millions of people across the world, who participate in online and in-person activities and events around the world aimed at accelerating environmental progress for people and planet.
Innovate4Cities Conference
The 2026 Innovate4Cities Conference (I4C26) is the fourth global convening that brings together local, regional and national governments, academia, civil society, and industry to close priority knowledge gaps and provide an evidence base that can be used to deliver city climate action.
High-level Political Forum on Sustainable Development (HLPF)
The High-level Political Forum on Sustainable Development (HLPF) will be convened from Monday, 6 July, to Wednesday, 15 July 2026, under the auspices of the Economic and Social Council (ECOSOC).
World Population Day
World Population Day is celebrated annually on 11 July to focus attention on the urgency and importance of population issues.
81st session of the UN General Assembly (UNGA 81)
The 81st session of the UN General Assembly (UNGA 81) will open on Tuesday, 8 September 2026. The first day of the high-level General Debate will be Tuesday, 22 September 2026.
World Cleanup Day
On 8 December 2023, the United Nations General Assembly, in its seventy-eighth session, unanimously adopted resolution 78/122 “World Cleanup Day”, which proclaims 20 September as World Cleanup Day.
The resolution invites all Member States, organizations of the United Nations system, other international and regional organizations, and other relevant stakeholders – including civil society, the private sector and academia – to observe…
World Habitat Day
World Habitat Day is marked on the first Monday of October each year and is recognized by the United Nations to reflect on the state of towns and cities, and on the basic right of all to adequate shelter. The day is also intended to remind the world that everyone has the power and the responsibility to shape the future of towns and cities.
Smart City Expo Miami
Among its most visible contributions is the internationally recognized Smart City Expo Miami, a flagship event that convenes global leaders, policymakers, business executives, and civic innovators each year. The expo has evolved into the leading platform for smart city dialogue and collaboration in the United States, connecting South Florida's unique local energy with global intelligence and insight.
By promoting cutting-edge ideas in…
UN Biodiversity Conference (CBD COP 17)
The 17th meeting of the Conference of the Parties (COP) to the Convention on Biological Diversity (CBD) will convene in October 2026.
World Migratory Bird Day
World Migratory Bird Day 2025 will focus on the theme, ‘Creating Bird-friendly Cities and Communities’. The theme highlights the need for a healthy coexistence between birds and humans and the opportunities to create and adapt environments that support migratory bird populations across all communities, from cities to smaller towns and communities.
5th meeting of the UN Forum of Mayors
The 5th meeting of the UN Forum of Mayors, “Cities Shaping the Future”, will be held in-person at the Palais des Nations, in Geneva, on 6-7 October 2025. Mayors from around the world will come together to exchange good practice and to collaboratively draft a set of recommendations, emphasizing the critical role of cities and local actors in shaping a sustainable future.
World Architecture Day
Created by the UIA in 1985, World Architecture Day is celebrated annually on the first Monday of October coinciding with the UN-Habitat Global Observance of the World Habitat Day.
World Habitat Day
World Habitat Day is marked on the first Monday of October each year and is recognized by the United Nations to reflect on the state of towns and cities, and on the basic right of all to adequate shelter. The day is also intended to remind the world that everyone has the power and the responsibility to shape the future of towns and cities.
World Maritime Day
The World Maritime Day theme for 2025 "Our Ocean, Our Obligation, Our Opportunity" reflects the ocean’s vital role in the world economy, with more than 80% of global trade transported by sea. The ocean is a source of jobs and food for millions of people, a home for countless marine species, and a regulator of the planet's climate, mitigating the impacts of climate change.
World Cleanup Day
On 8 December 2023, the United Nations General Assembly, in its seventy-eighth session, unanimously adopted resolution 78/122 “World Cleanup Day”, which proclaims 20 September as World Cleanup Day.
The resolution invites all Member States, organizations of the United Nations system, other international and regional organizations, and other relevant stakeholders – including civil society, the private sector and academia – to observe…
European Mobility Week
European Mobility Week is the European Commission’s flagship awareness-raising campaign on sustainable urban mobility. It promotes behavioural change in favor of active mobility, public transport, and other clean, intelligent transport solutions.
The main event takes place from 16 to 22 September each year, culminating in the popular Car-Free Day. Local authorities are encouraged to use this week to test innovative planning measures,…
13th International Conference on Sustainable Development
The 13th International Conference on Sustainable Development (ICSD) will be held on the theme, ‘Creating a Unified Foundation for Sustainable Development: Research, Practice, and Education’. The Conference aims to bring together individuals from research, policy, practice, and business to share ideas, present research fundings, and discuss professional issues relevant to sustainability science.
80th Session of the UN General Assembly (UNGA 80)
The 80th session of the UN General Assembly (UNGA 80) will open on Tuesday, 9 September 2025. The first day of the high-level General Debate will be Tuesday, 23 September 2025.
Second Africa Climate Summit
The Second Africa Climate Summit aims to redefine Africa’s aspirations for a climate-resilient and prosperous future. The Summit will focus on the theme, ‘Accelerating Global Climate Solutions: Financing for Africa’s Resilient and Green Development’.The Second Africa Climate Summit aims to redefine Africa’s aspirations for a climate-resilient and prosperous future. The Summit will focus on the theme, ‘Accelerating Global Climate Solutions:…
World Humanitarian Day
World Humanitarian Day is commemorated every year on 19 August to pay tribute to humanitarian workers killed and injured in the course of their work, and to honor all aid and health workers who continue to provide life-saving support and protection to people most in need. The Day highlights the importance, effectiveness, and positive impact of humanitarian work.
International Youth Day
International Youth Day is celebrated annually on 12 August to bring youth issues to the attention of the international community and celebrate the potential of youth as partners in today’s global society.
The Day gives an opportunity to celebrate and mainstream young peoples’ voices, actions, and initiatives, as well as their meaningful, universal, and equitable engagement. The UN General Assembly (UNGA) established the Day on 17…
ASEAN Sustainable Urbanization Forum (ASUF)
The ASEAN Sustainable Urbanisation Forum (ASUF) 2025 stands as a landmark event, being the first urban forum hosted by an ASEAN Chair. This forum underscores the pressing need for a collaborative and unified approach to tackle the complex challenges posed by urbanization in the region.
Among its key focus is to strengthen local policy frameworks, promote innovative mechanisms and harness new technology for the development of inclusive…
International Day of the World’s Indigenous Peoples
The International Day of the World’s Indigenous Peoples takes place annually on 9 August to celebrate Indigenous Peoples and their knowledge and raise awareness of the needs of these groups. The Day highlights rights of Indigenous Peoples to make their own decisions and carry them out in ways that are meaningful and culturally appropriate to them.
Third UN Conference on LLDCs
The Third UN Conference on Landlocked Developing Countries (LLDCs) will explore innovative solutions to challenges faced by LLDCs and build meaningful, strategic partnerships to unlock the potential of LLDCs. The Conference will convene under the theme, ‘Driving Progress Through Partnerships’.