In order to analyse the ways in which problematic ethno-national behaviour at dark events in the Western Balkans undermines the transition from conflict, to post conflict and then peaceful societies, this research employed a sociological discourse analysis to critique the role dark events play in post-conflict tourism development and peaceful coexistence. Accordingly, by combining previous analyses of dark commemorative events with a new analysis of sport events, this research explains the relationship between event tourism and 16th Sustainable Development Goal (SDG) focused on peace, justice and strong institutions. This media-based analysis shows that dark commemorative and sport events share similar historical contexts, dissonant heritage and the dark leisure practices of attendees. These dark events attract tourism flows across national boundaries in the region, as well as including more widely dispersed diasporas, and international media and politicians. The prevalence of dark events in the region, which feature strongly in tourism flows, require significant attention in order to promote sustainable development. The findings of this research can be used to develop future research into the relationship between dark events and SDG16, using methods that build on this exploratory study and the new model of dark events that it provides.