At the cusp of the LHC restarting data-taking in 2022, the workshop aims to bring together experts from experimental and theory communities to plan and prepare for the path ahead. This includes development of theory models to better control systematics in the experimental analyses, common HEP software tools for large-scale fits and improvements in lattice QCD calculations. We expect valuable discussions on both conventional and exotic spectroscopy in the context of cross-experiment amplitude analyses and foster new collaborations between theory and experiment.