This is an announcement of the forthcoming thematic semester on Descriptive Set Theory and Polish Groups that will take place at the Bernoulli Center in Lausanne, Switzerland, from January 1st to June 30th, 2018.

The focus of the semester will be on Descriptive Set Theory and Polish Groups along with applications in other branches of mathematics. While there will be continuous activity at the center throughout the semester, three conferences and two additional workshops will provide the main events. The themes of these will be

Borel combinatorics and ergodic theory

Structure and dynamics of Polish groups

Descriptive set theory

Ideals and exceptional sets in Polish spaces

Large scale geometry of Polish groups