ExCALIBUR is a UK-based initiative that aims to deliver the next generation of high-performance simulation software for the highest-priority fields in UK research. It started in October 2019 and will run through until March 2025, redesigning high priority computer codes and algorithms to meet the demands of both advancing technology and UK research. During these sessions, we will host a wide range of speakers who will talk about the challenges that they face when trying to perform science using Exascale supercomputers. We will have sessions on parallel scalability, multiscale modelling, HPC for biomedicine, uncertainty quantification and quantum computing, as well as an interactive session on agent-based modelling and two plenary discussions. This track is sponsored by the SEAVEA ExCALIBUR project, will take place on July 1st and is free to attend for anyone joining for ICCS.