The founding is well documented and the trajectory is the interesting part. The first assembly was held in January 2013 in a deconsecrated church in Islington and drew more than three hundred people; one London event later drew as many as six hundred. In October 2013 the movement ran an Indiegogo campaign with a target of five hundred thousand pounds to build infrastructure for the network, and raised 33,668 pounds — a shortfall of more than ninety per cent, and one that shaped everything afterwards, since it meant the chapters had to run on unpaid time. Some atheists publicly questioned the founders' motives at the time, suggesting money was the object, which the numbers do not support. Sunday Assembly in America is now a registered 501(c)(3) and the network still runs conferences, most recently planning one for 2026.