This event listing is based on historical patterns and may not be officially confirmed. Dates, venue, and details are subject to change. Please verify with the event organizer or official website before making travel arrangements.
Verify on official websiteThe C40 World Mayors Summit 2025, co-hosted by the Mayor of London and C40 Cities Co-Chair Sadiq Khan and the Mayor of Rio de Janeiro Eduardo Paes, brought together mayors from nearly 100 C40 cities, alongside business leaders, philanthropists, investors, academics, and civil society. Taking place from 3-5 November in Rio de Janeiro, just days before COP30 in Belém, the Summit marked a critical moment for city-led climate action.
Monday, November 3, 2025 - Wednesday, November 5, 2025
London, Brazil
The C40 World Mayors Summit 2025, co-hosted by the Mayor of London and C40 Cities Co-Chair Sadiq Khan and the Mayor of Rio de Janeiro Eduardo Paes, brought together mayors from nearly 100 C40 cities, alongside business leaders, philanthropists, investors, academics, and civil society. Taking place from 3-5 November in Rio de Janeiro, just days before COP30 in Belém, the Summit marked a critical moment for city-led climate action.
Receive curated event recommendations based on your interests.
See how WebMobi helps you manage registration, check-in, and analytics.
Request a DemoOr start free trial →C40 World Mayors Summit 2025 takes place on Monday, November 3, 2025 to Wednesday, November 5, 2025 in London. All times are in UTC.
WebMobi provides event registration, ticketing, mobile apps, check-in, and analytics — all with zero platform fees.
Get curated B2B events, AI-powered insights, and industry trends delivered to your inbox