Since its first steps in June 2001, CP2K has grown into a widely used open-source package for atomistic simulations of molecules, interfaces, and solid-state systems, reaching more than 2000 citations per year. From ab initio molecular dynamics to large-scale condensed phase simulations, and from hybrid functional calculations to enhanced sampling, CP2K has brought advantages to many communities. To mark the 25th anniversary of CP2K, this three-day workshop will bring together developers and users to showcase current capabilities and scientific applications, exchange knowledge, and discuss priorities for the next development steps. The event will offer a unique opportunity for users, developers, and contributors to interact closely, fostering collaboration and shaping the code’s trajectory for the next 25 years. CP2K supports a wide range of atomistic simulation methods, including density functional theory (DFT), wavefunction-based approaches, classical force fields, and hybrid QM/MM schemes. Its features cover structure optimization, molecular dynamics, excited-state calculations, and enhanced sampling techniques, all designed for efficient parallel performance on modern computing architectures.