The "CIMPA School on Group Actions in Arithmetic and Geometry" was held at the Gadjah Mada University, Yogyakarta, Indonesia during the period 17-28 February, 2020. The lectures were held by 12 lecturers from 4 different countries. There were 65 participants (not including the lecturers) from 11 countries. The program of the school was designed to give a wide variety of instances of actions of groups in arithmetic and geometry. The topics which were covered included: finite fields, coding theory, covering spaces, representation theory, modular forms and Galois theory.
Further information can be found here.
For the report go here.