Bangkok, Friday, April 22, 2022, via online platform. On April 22, 2022, Dr. Premjai Vungsiriphisal, ARCM senior researcher was invited to be a keynote speaker for the 6th UDC Public Lecture on Demography in Big City and Vicinity. The lecture was organized by Urban Disease Control and Prevention Foundation (UDCF), covered content on Demography, Biodemography, Medical demography, Urban population, Urban and migration. The lecture received attention from 98 audiences: medical doctors, nurses, public health personnel from disease prevention unit nationwide.