Question: When was Stonehenge used for the site of the Stonehenge Free Festival?
About the article "Stonehenge", section "Neopaganism".

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Stonehenge emerged as the most important free festival after the violent suppression of the Windsor Free Festival, in August 1974, and the lack of success in finding a permanent home for the People's Free Festival, after Watchfield 1975. 
Throughout the 20th century, Stonehenge began to be revived as a place of religious significance, this time by adherents of Neopagan and New Age beliefs, particularly the Neo-druids.
The historian Ronald Hutton would later remark that "it was a great, and potentially uncomfortable, irony that modern Druids had arrived at Stonehenge just as archaeologists were evicting the ancient Druids from it."
The first such Neo-druidic group to make use of the megalithic monument was the Ancient Order of Druids, who performed a mass initiation ceremony there in August 1905, in which they admitted 259 new members into their organisation.
This assembly was largely ridiculed in the press, who mocked the fact that the Neo-druids were dressed up in costumes consisting of white robes and fake beards.
Between 1972 and 1984, Stonehenge was the site of the Stonehenge Free Festival.
After the Battle of the Beanfield in 1985, this use of the site was stopped for several years and ritual use of Stonehenge is now heavily restricted.
Some Druids have arranged an assembling of monuments styled on Stonehenge in other parts of the world.
By now a powerful and instantly recognisable symbol, the monument was featured in a wide number of ways.
The Beatles are seen performing on Salisbury Plain with Stonehenge visible in the background in their 1965 film "Help!".
The site has also been used for concerts, starting with the Stonehenge Free Festival in 1972.
Perhaps in recognition of the site's link to popular music, the mockumentary film "This is Spinal Tap" featured the titular fictional rock band band performing a song named "Stonehenge" on stage.
In one of the many embarrassing events on their comeback tour, confusion about abbreviating inches and feet results in a Stonehenge replica so small that it was in danger of being trod upon by the Little People hired to dance around it.
The momument continues to be featured in film, television and radio, either to question the origin or history of Stonehenge, or to play upon its position as an instantly recognisable structure and symbol of Britain.
In books by Kurt Vonnegut and S. M. Stirling amongst others, alternative theories are suggested and explored as part of the larger plot.
The monument has also become popular in computer games, where alternative uses are often posited for Stonehenge, or its iconic nature is explored.
Stonehenge is also depicted in ice age.
Stonehenge plays a big role in the "Doctor Who" episodes "The Pandorica Opens" and "The Big Bang". 
Aside from modern replicas, several other archaeological sites have had Stonehenge's name partially or fully incorporated into their own names.
America's Stonehenge is an unusual and controversial site in New Hampshire.
A henge near Stonehenge containing concentric rings of postholes for standing timbers, discovered in 1922, was named Woodhenge by its excavators because of similarities with Stonehenge.
The name Woodhenge is also used for the American site of Cahokia.
The timber Seahenge in Norfolk was named as such by journalists writing about its discovery in 1998.
In November 2004, a 7 m diameter circle of postholes was found in Russia and publicised as the Russian Stonehenge.
Other prehistoric sites elsewhere, often also with proposed astronomical alignments, are often described by journalists as being that region's '"answer to Stonehenge".
In May 2006, reports emerged of an "Amazon Stonehenge" Calçoene, 390 kilometres from Macapá, the capital of Amapá state, near Brazil's border with French Guyana.
It comprises 127 stones, possibly forming astronomical observing points.