|2013||Inaugural meeting of the COSA Board (July)|
|2012||COSA membership votes at the AGM to change the organisations governance structure and become a Company Limited by Gaurantee|
|2017-2018||Professor Phyllis Butow AM|
|2015-2016||Professor Mei Krishnasamy|
|2016||The Pharmacology of Cancer Chemotherapy for Advanced Trainees - NSW, Qld & Vic|
|2016||COSA ACTNOW Weekend|
The COSA logo and the legend of the Marryalyan
The Marryalyan is the two-snake emblem of the Warramirri people whooccupied a large group of islands in the Arafura Sea off the northern coast of Australia, now known as the Wessel Islands. Most Warramirri people now live on Elcho Island.