The "African Workshop on Mathematical Optimisation" was held at the University of Zululand, South Africa during the period 11-15 November, 2019. With the target of introducing state of the art methods and developments in mathematical optimization, the school addressed a variety of topics in this field. Main topics included linear and non-linear programming, stochastic optimization, large scale optimization, dynamic optimization, multilevel programming and game theory along with computational optimization, specifically metaheuristics.

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.

The "16th Discussion Meeting in Harmonic Analysis" was held at the Indian Institute of Science Educaton and Research, Bhopal, India during the period 16-19 December, 2019. This conference is the most important activity in the area of harmonic analysis in India and is conducted once in every two years. The main goal of the conference is to provide young researchers with a platform in order for them to interact with the leading experts in this area. There were around 95 participants at the conference, with participants from all around the world.

The Research School on Quantum Symmetries was held in Bogota, Colombia during the period June 24 - July 5, 2019. The research school took place in two weeks (10 working days). The meeting consisted of a series of lectures (six mini-courses, one hour and a half for days every mini-course), each mini-course with three problem-sessions, two research talks, one public lecture (given by Eric Rowell),  two training sessions, a poster session and a reception. All conferences and activities, except for the public lecture, were held in English.

The "International conference on Class Groups of Number Fields and related topics" was held in Allahabad, India during the period 16-19 October, 2019. The conference covered a wide range of topics related to algebraic number fields, which is an active area of research in number theory. A number of internationally renowned experts from these areas where hosted, who shared their research and expertise to the researchers from India and other neighboring countries like Nepal, Bhutan, Bangladesh, Myanmar and Sri Lanka.