Extreme heat is an escalating threat to health and well-being, calling for stronger preparedness, coordinated action and protection of populations most at risk. This COP31 event organized by WHO/Europe will bring together policymakers, experts and local actors from across the European Region to share lessons from recent heatwaves and explore practical solutions that translate heat-health policies into action, from national strategies to community-level initiatives. Speakers will include delegates from the following organizations: the European Commission; the German Federal Ministry for the Environment, Climate Action, Nature Conservation and Nuclear Safety; United for Global Mental Health; the International Federation of Red Cross and Red Crescent Societies; the cities of Athens and Paris; the Royal Institute of British Architects; the World Meteorological Organization; and the Pan-European Commission on Climate and Health. WHO/Europe has published the second edition of its guidance on Heat–Health Action Plans (HHAPs), providing an updated framework to support countries and communities in strengthening preparedness, coordinated responses and protection against the growing health risks of extreme heat.