December 2023 marks Yvonne Choquet-Bruhat's 100th birthday. For this special occasion, IHES organizes a day in her honor on December 8, 2023. Yvonne Choquet-Bruhat's work has had a long-lasting impact on the field of mathematical relativity starting with her seminal 1952 paper on the local well-posedness of Einstein equations. Her numerous contributions, both to constraint equations and to the evolution problem in general relativity, have deeply influenced several generations of researchers. This special day in her honor will be the occasion to present some of the latest developments in the field.