The 4th Doctoral Symposium at SEFI 2020 attracted 21 doctoral students and 17 senior researchers. For the first time, it was organised as a fully online event. In preparation, the doctoral students wrote extended abstracts to introduce themselves and their PhD projects, while the seniors provided reading tips and advice. The intense, full-day program was based on group discussions and interactive plenary sessions. The Doctoral Symposium was concluded by a session in which each participant presented their take-home message. This paper outlines how the Doctoral Symposium was organised and summarizes some of the documentation.