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The Conway Hall Ethical Society, formerly the South Place Ethical Society, based in London at Conway Hall, is thought to be the oldest surviving freethought organisation in the world and is the only remaining ethical society in the United Kingdom. It now advocates secular humanism and is a member of the Humanists International. (Wikipedia)

Wikipedia Conway_Hall_Ethical_Society#Conway_Hall
Capacity 300
Address 25 Red Lion Square, London, WC1R 4RL , London, UK
Architect Frederick Mansford
Opening year 1929, September 23rd
Official website https://conwayhall.org.uk/