Circle said on X that it will hold a Dev Day Cafe event on Sept. 29 at Radhaus in Fort Mason, San Francisco, together with the Solana Foundation and MoonPay. The program will feature product demos, a live demonstration of Circle Agent Stack, and discussions focused on smart payments and the smart economy. The announcement names the venue, date and partner organizations, and outlines the main agenda items disclosed so far. No additional event details were provided in the source beyond the scheduled demonstrations and discussion topics.