In May 1969 the groundbreaking book of Jean-Marie Souriau appeared, "Structure des Systèmes Dynamiques". We will celebrate, in 2019, the jubilee of its publication, with a conference in honour of the work of this great scientist. The subjects are : Symplectic Geometry/Mechanics, Relativity and Cosmology, Geometric Quantization, Diffeology, and anything related to these domains.