We celebrate Thesswiki project with the organisation of an Editathon on 26th of September. Citizens and friends of Thessaloniki from Greece and abroad will gather in order to write articles about the history and culture of the city. Their inspiration will be the collections of Thessaloniki Museums, which have given open digital content in the framework of the project and enabled the reuse through WikiCommons and Wikipedia. During that day signs with QR codes will be placed in selected places in the city where guests will be able to receive on their mobile phones information through Wikipedia, directly in their own language. Finally, special tours will be organized in collaboration with museum curators only for the participants and the speakers. Let's contribute together to the history and the civilisation of Thessaloniki through the global encyclopedia. You can see the program here.