Events are varied in terms of their type, scale, duration, location, time of year and theme, and this leads to equally varied impacts. However, all events involve impacts on or of ecology, transport, water, energy, lighting, noise and waste. Sustainable event design should involve a deliberate attempt to mitigate negative impacts and legacies for the greatest number of stakeholders while leveraging the event to maximise positive impacts and legacies for the greatest number of stakeholders. This chapter presents a six-step methodology for environmentally sustainable event design. Although the chapter focuses on the environmental dimension of sustainability, it should be borne in mind that the environmental impacts and legacies of an event must be considered alongside – and balanced against – the social and economic impacts and legacies of the event. Industry insight is provided from Chris Johnson of Kambe Events, the sustainable event production and consultancy company that organises the multi-award-winning UK festival Shambala. Key words: environmental impacts, environmental legacies, sustainable event design.