International Open Access Week is organised by SPARC in partnership with the Open Access Week Advisory Committee. It was founded in 2008 by SPARC and partners in the student community.
Open Access Week is an opportunity for the academic and research community to continue to learn about the potential benefits of Open Access, to share what they’ve learned with colleagues, and to help inspire wider participation in helping to make Open Access a new norm in scholarship and research.
This year’s theme asks a pointed question about the present moment and how, in a time of disruption, communities can reassert control over the knowledge they produce: Who Owns Our Knowledge?
More information 
https://www.openaccessweek.org/
The official hashtag of Open Access Week is #OAweek.