On May 2 and 3, Ella van Vloten and Jean Wagemans organized a Hackathon for COST Action APPLY in Amsterdam. During the Hackathon, Federico Gobbo taught participants the goings of editing Wikipedia pages. With a group of six people, we had two intensive days during which we acquired the skills of editing on Wikipedia. We achieved to improve pages on argumentation by editing several of these pages, translating pages into six different languages, and creating new Wikipedia pages. The first Wikipedia Hackathon was a great success!