The third international conference on E-Assessment in Mathematical Sciences (EAMS) takes place between 22nd June and 1st July 2020. The conference brings together researchers and practitioners with an interest in e-assessment for mathematics and science. Following successful events in Newcastle upon Tyne in 2016 and 2018, EAMS 2020 will be an entirely online conference, featuring a mix of live sessions and web-based activities, with plenty of opportunity for discussion and collaboration. As many of us prepare to continue delivering teaching and assessment online for the foreseeable future, EAMS 2020 presents an opportunity for experts in the field to share best practice, and for those new to e-assessment to get hands-on with software. Live talks will take place over Zoom at 9am or 4pm BST (UTC +1) each day, with recordings available later. We hope that the online format and longer timescale will allow participants to engage more deeply with the material presented.