The 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 we organize a school in Bogotá following the previous schools in Havana, followed by schools in Montevideo, in Uberlândia, in La Plata. and again in Havana. Lecturers Mois I. Aroyo, University of the Basque Country, Spain Massimo Nespolo, Université de Lorraine, France Leopoldo Suescun, Universidad de la Republica, Uruguay Arbelio Penton-Madrigal, Universidad de la Habana, Cuba Mike Glazer, University of Oxford, United Kingdom