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Abstract: Ever since Kazhdan’s work on property (T) and Margulis’ super rigidity and normal subgroup theorems algebraic, geometric, and analytic aspects are deeply linked in the study of arithmetic groups. The workshop brings together experts in non-positive curvature, arithmetic groups, and operator algebras to discuss recent far-reaching generalizations of Kazhdan’s and Margulis’ work which include non-arithmetic groups as well.