Courses in Arithmetics and Algebraic Geometrybr br Perfectoid Spaces and the Weight-Monodromy Conjecturebr Peter SCHOLZEbr br usually Thursdays 14h30-16h30br Marilyn and James Simons Conference Centre or Léon Motchane Amphitheatre, IHÉSbr Jointly organized and founded by the Institut des Hautes Études Scientifique and the Fondation mathématique Jacques Hadamard ­br Organizers ­br Ahmed Abbes (CNRS, IHÉS), Christophe Breuil (CNRS, Université Paris-Sud), ­­Laurent Lafforgue (IHÉS)br br This new series of courses aims at presenting recent results or works in progress in Arithmetic Geometry, that bring significant breakthroughs in their area or shed new insights on classical results. Speakers will be chosen among the main contributors to these works, observing a balance between young and senior experts in the field.br Two or three courses will be organised per year. Each course will consists of a series of 4 to 6 two-hour sessions over one month. Speakers are kindly requested to be understandable by non specialists (especially students), at least for the first sessions.