The Data Modelling Days is an online event designed for the Wikidata community and focusing on how we describe and organize data on Wikidata. During 3 days of discussions, workshops and social events, we will cover a broad range of modelling challenges and other tricky cases. This event offers a space for editors of all experience levels as well as data reusers to discuss, learn new tips and tools, work on Wikidata’s ontologies together and improve documentation and project pages.