The IUCr Commission on Mathematical and Theoretical Crystallography is strongly committed to promote education in all the fundamental aspects of crystallography that nowadays are overlooked in common University courses. This mission is accomplished through a series of meetings in a wide range of regions. In fall 2018 the Commission organized a school in Bogotá following previous schools in Havana, followed by schools in Montevideo, in Uberlândia, in La Plata. and again in Havana.