La Ciudad de las Ideas (stylized as CDI) is an annual conference held in Puebla, Mexico, produced by Mexican writer and television producer Andrés Roemer. Its objective is to debate ideas in science, technology, art, design, politics, education, culture, business, entertainment, and other areas of knowledge. The event has been referred to as the "brain olympics" by cognitive scientist Daniel Dennett. Since 2008, up to 3,600 attendees have gathered in November in the historic center of Puebla.