Participant symposia, which are oral presentations selected from submitted abstracts, have been a welcome addition since the ICN in 2010.  For the 2020 meeting, the PC decided to organize 12 Partipant Symposium sessions. This will increase exposure of young investigators as well as allow the PC to flag interesting and unusual topis that are not represented in the Invited Symposia. Participant Symposia talks will be 15 minutes each.