The annual meeting of COST Action ‘NEXT’ will be held at the Institute of Physics of Zagreb (HR), 14-18th July. The main goal of NEXT is to promote the development and application of advanced non-linear extreme ultraviolet (EUV) to X-ray spectroscopic and imaging techniques, enabled by Free Electron Laser (FEL) facilities and lab-based High-order Harmonic Generation (HHG) sources . . .