Nature One

Nature One is one of the largest European open-air electronic music festivals, featuring many renowned DJs from Germany and all over the world. In significance it is not as big as Mayday nor as old, having started three years later than the Mayday festival. However, attendance has surpassed the Mayday, even when one takes into account that the Mayday only lasts one evening, while the Nature One has two main evenings with additional smaller events from Thursday till Sunday.

Source: Wikipedia ↗