Geometry and topology have been areas of excellence for mathematical research in Canada for many decades. This includes significant and on-going contributions in a diverse array of topics including low dimensional topology, geometric group theory, symplectic topology and geometry, homotopy theory, geometric topology, geometric analysis, algebraic geometry, etc. Soon after the summer 2015 staging of the highly successful PIMS Symposium on the Geometry and Topology of Manifolds, it was proposed that a pan-Canadian biennial workshop focused on geometry and topology be organised as a joint venture of the CRM, the Fields Institute, and PIMS. The first CGTS was held at the Fields Institute during March of 2018 and future venues will rotate around the country with Montreal the site of the the second CGTS.