Ladies That FOSS is WMDE's first Open Source Hack Event aimed primarily at women who want to join a Free and Open Source Software (FOSS) project but don’t know where to start. This is a unique opportunity for nonbinary and woman coders to test out uncharted waters and code FOSS by meeting some people who already got the FOSS flu and are deeply involved in projects. So this is how it works. This day will be a one-day hack event where women get the chance to dive into the FOSS movement and try out projects. Projects will give women the chance to hack with them on something which can be accomplished on that day. While hacking, the new women on the team can get to know the FOSS movement and see what impact they can have. This is an event which will offer newcomers the opportunity to engage closely with the projects. Only four to six participants are matched with a project. A unique chance to get to know some of the coolest projects and coders out there and become part of the FOSS community. There will be plenty of time for learning, trying, chatting, eating and *most of all, coding FOSS*. We already welcome Wikidata, Mozilla's Firefox Browser, Coala and most likely Apache - BUT the collaboration is missing MediaWiki! Please contact us, if you would like to become a MediaWiki mentor and join this event. Please get in touch with julia.schuetze(a)wikimedia.de and myself if you are interested and possibly able to help. Thanks! Rachel