Every two years since 2012, the International Ocean Colour Coordinating Group (IOCCG) has conducted the advanced IOCCG Summer Lecture Series at the Laboratoire d’Océanographie de Villefranche (LOV) in Villefranche-sur-Mer, which is part of the IMEV (Institut de la Mer, de Villefranche), and hosts the Marine Optics and Remote Sensing group (MORS, www.obs-vlfr.fr/LOV/OMT/). Unfortunately the 2020 Summer Lecture Series, scheduled to take place from 22 June – 3 July 2020, had to be cancelled due to the COVID-19 pandemic. The next Summer Lecture Series is planned for June/July 2022 and will be dedicated to to high-level training in the fundamentals of ocean optics, bio-optics and ocean colour remote sensing, as in previous years. Video recordings and PowerPoint presentations of all previous IOCCG Summer Lecture Series are available online at https://ioccg.org/what-we-do/training-and-education/ioccg-sls-2018/#toggles.