The Haydom language documentation training workshop was a 5-day gathering whose main goal was to train native speakers of the Tanzanian languages Ihanzu and Hadza to independently conduct ethical audiovisual language documentation in their own communities. This report provides a narrative account of the workshop, as well as reflections and recommendations for individuals interested in developing an event like this in low-resource contexts. The report also features photos taken during the workshop, as well as testimonials from attendees. Note: This report has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Harvey, Andrew, and Richard Griscom. 2020. Haydom Language Documentation Training Workshop - January 2020: A Report. DOI: 10.5281/zenodo.3971733