The 20th International Workshop on Next generation Nucleon Decay and Neutrino Detectors (NNN19) will be held by the first time in Latin America at the University of Medellin (Colombia), on November 7-9, 2019. This series of workshops brings together experts from across the particle physics community to discuss future large scale detectors for research on nucleon decay and neutrino physics. This year NNN will complete 20 years since its first version on 1999 at Stony Brook University (NY).