We invite your participation in *Endangered Data Week* <http://endangereddataweek.org/>, a distributed network of events running from April 17th-21st, 2017: endangereddataweek.org *Endangered Data Week* is a new, annual, grassroots effort to: - raise awareness of threats to publicly available data of all kinds, across sectors and disciplines; - provide opportunities to explore the power dynamics of data creation, sharing, privacy, and retention; - build community capacity by teaching ways to make #EndangeredData <https://twitter.com/search?q=%23EndangeredData> more accessible and secure. Browse for online events and opportunities near you: http:// endangereddataweek.org/map/ <http://endangereddataweek.org/map> Nothing nearby? Please help make this first *EDW* a success by planning a gathering and adding it <https://docs.google.com/forms/d/e/1FAIpQLSeTZ30rbBS5axmn-QpWZML_nEqT_bmiz9V2TiQYYTTQSsKUxw/viewform> to our list and map! We especially encourage events that promote care for endangered collections by: - publicizing the availability of datasets to diverse communities; - increasing critical engagement with data, including through visualization, analysis, and storytelling; - encouraging activism and advocacy for open data policies; - fostering needed skills through workshops on data curation, documentation and discovery, improved access, and preservation. Finally, we welcome contributions to our small supplementary collection <https://wiki.diglib.org/Endangered_Data_Week> of *EDW* resources. *Endangered Data Week* is facilitated by a dedicated team of volunteers, including Brandon Locke and Jason A. Heppler, supported by the Digital Library Federation <https://diglib.org/> and in partnership with a new DLF interest group on Records Transparency/Accountability <https://www.diglib.org/archives/13609/>, led by Rachel Mattson. Additional supporters include DataRefuge <https://www.datarefuge.org/> and CLIR <https://www.clir.org/>.