The document discusses Tomorrowland, an annual electronic music festival held in Belgium since 2005. It notes that the festival has grown significantly over the years to attract over 180,000 visitors across its 3 day event. Reasons for its success include extensive publicity efforts through websites and social media, well-organized event planning with over 450 artists performing across 16 stages, and strong visuals and dance experiences that appeal to an international audience who enjoy electronic dance music.