The Glastonbury Festival of Contemporary Performing Arts, commonly abbreviated to Glastonbury or Glasto, is the largest green field open-air music and performing arts festival in the world. Organiser Michael Eavis stated that he decided to host the first festival, then called Pilton Festival, after seeing an open air Led Zeppelin concert at the Bath Festival of Blues and Progressive Music 1970 at the nearby Bath and West Showground in 1970. The Big Green Gathering (BGG) was a festival with an environmental focus which happened during most summers between 1994 and 2007. It was held at various locations in Somerset and Wiltshire. The event grew from the Green Fields area of the Glastonbury Festival.