The project (Re)uniting the East and West: Reflections on the 2004 EU enlargement (REWEU) is focused on the commemoration of the 2004 “big bang” EU enlargement at the occasion of its 20th anniversary in May 2024. This event had numerous positive effects on shaping Europe as we know it today, boosting its security, economic potential, and spreading democracy, good governance and European values across the European continent.