The ESID 2024 programme is designed to foster in-depth discussions, ensure the exchange of expertise, and provide cutting-edge research in the field of immunodeficiencies and human inborn errors of immunity (IEI). As part of this dynamic programme, we are excited to present a series of Meet-the-Expert sessions led by renowned professionals. These sessions offer attendees the opportunity to engage directly with experts, ask questions, and delve into real-world examples from clinical practice. In addition to these interactive sessions, parallel sessions will run concurrently, covering a wide array of topics ranging from viral diseases and actinopathies to inflammatory disorders and bacterial infections. Join us for stimulating conversations and valuable insights into the latest advancements in IEI.