This article from World Archaeology explores the archaeological investigation of temporary mega-events, using the 1851 Great Exhibition and its Crystal Palace as a case study. The author examines the surprisingly persistent material traces of this event, including the building’s materials and the site’s modifications, even after its relocation and destruction. The study challenges the notion of complete ephemerality by considering the subtle, long-lasting impacts of such events. It highlights the contrast between the event’s documented history and its scant physical remains, exploring the interplay between human labor, industrial processes, and the event’s legacy. The article also discusses the reuse and repurposing of the Crystal Palace site over time, reflecting the complex relationship between temporary gatherings and their lasting material consequences.