On Wednesday, November 10, 2021, an International Lecture Series 2021 activity was held with the theme Migration, Environmental Planning, and Gender. The theme of this sixth series of activities is related to Sustainable Development Goal 11 on Sustainable Cities and Communities, and Sustainable Development Goal 5 on Gender Equality. The number of participants in the International Lecture Series 2021 this time is 168 participants who come from the academic community and alumni of Diponegoro University. On this occasion, Prof. Dr. Felicitas Hillmann of the Georg-Simmel-Center for Metropolitan Studies at Humboldt-University, Berlin, Germany. In his presentation, Prof. Dr. Felicitas Hillmann explains about “Migration, Environmental Planning, and Gender”. The next session was followed by a presentation from Mrs. Landung Esariti, MPS from the Department of Urban and Regional Planning about her research entitled “Residential Mobility Decision of Urban Poor Household of Semarang City”. In this activity, Mrs. Maya Damayanti, Ph.D. acted as the moderator of the activity, guiding the presentation session, discussion until the end of the activity. From the two explanations, it can be concluded that the ability to migrate can be influenced by various interrelated social factors and life journey transitions such as gender, age, ethnicity, formal education, social networks, and marital status. Mobility is not an option for everyone, where gender roles, education and other social factors determine mobility and immobility. In addition, in the context of environmental planning more gender-based research is needed to allow a wider planning perspective.