CYSS was advertised by direct invitations to individual researchers working in the field of photocatalysis, emails to institutional and international mailing lists, and via twitter. Twitter is a good option for advertising, as it is one of the main social media platforms for academics, allows for tagging of speakers and institutes to extend the audience of advertising, and also functions as a secondary networking space outside of the CYSS Mattermost hub and after the conference. In total, nearly 180 people from 31 countries registered for the conference with over 60 submissions for talks and/or poster presentations. The majority of these registrations came from researchers who have yet to obtain their doctoral degree, while professors and group leaders were only present as a minority, with most of them consisting of invited speakers (Figure ). We estimate that c. 120 people actively participated in the conference, based on the number of unique registrations on our Mattermost chat server, including 7 invited speakers, 29 plenary speakers, and 33 poster presentations. From the 63 submitted abstracts, roughly a third was submitted by women. The male-to-female ratio at CYSS roughly corresponds to the ratio in chemistry in general .