Festival branding is undergoing a revolution based on the consolidation of new communicative behaviours in virtual brand communities (VBC), above all channelled through social media platforms (Hudson & Hudson, 2013; MacKay, Barbe, Van Winkle, & Halpenny, 2017). Although generic literature (Dessart, Veloutsou, & Morgan-Thomas, 2015) has highlighted the role of user engagement in VBC, there are no in-depth analyses of how users modulate engagement attributes and behaviours and how they are related to festival branding, as well as other possible and sometimes interrelated drivers (social capital creation, place making). Thus, this paper aims to characterise these elements in festivals’ VBC to cover these shortcomings. This proposal performs a multi-platform, multi-period, multi-user and mixed-method analysis of nearly 2,150 references in the Twitter and Facebook VBC of one of the most prominent music festivals in Europe, Sónar (Barcelona). Results show the benefits for organisers (and other relevant users) of jointly understanding these elements (and their mutual relationships) with the aim of retaining various positive economic and social impacts.