A GPU hackathon is a 5-day coding event in which teams of developers port their applications to run on GPUs, or optimize their applications that already run on GPUs. Each team consists of three or more developers who are intimately familiar with (some part of) their application, and they work alongside two mentors with GPU programming expertise. The mentors come from universities, national laboratories, supercomputing centers, government institutions, and vendors. The Swiss National Supercomputing Centre is pleased to announce that the fifth GPU-programming EuroHack will be held from September 30 to October 04, 2019 at the Hotel De La Paix  in Lugano, located in the Italian area of Switzerland.