This is what we found on Wikipedia regarding the In The Field Festival:

The Glastonbury Festival (formally the Glastonbury Festival of Contemporary Performing Arts and known colloquially as Glasto) is a five-day festival of contemporary performing arts held near Pilton, Somerset, England, in most summers. In addition to contemporary music, the festival hosts dance, comedy, theatre, circus, cabaret, and other arts. Leading pop and rock artists have headlined, alongside thousands of others appearing on smaller stages and performance areas. Films and albums have been recorded at the festival, and it receives extensive television and newspaper coverage.

Glastonbury takes place on 1500 acres of farmland and is attended by around 200,000 people, requiring extensive security, transport, water, and electricity-supply infrastructure. While the number of attendees is sometimes swollen by gatecrashers, a record of 300,000 people was set at the 1994 festival, headlined by the Levellers, who performed on the Pyramid Stage. Most festival staff are unpaid volunteers, helping the festival to raise millions of pounds for charity organisations.

Regarded as a major event in contemporary British culture, the festival is inspired by the ethos of the hippie, the counterculture of the 1960s, and the free festival movement. Vestiges of these traditions are retained in the Green Fields area, which includes sections known as the Green Futures, the Stone Circle and Healing Field. Michael Eavis hosted the first festival, then called the Pilton Festival, after seeing an open-air Led Zeppelin concert in 1970 at the Bath Festival of Blues and Progressive Music.

The festival was held intermittently from 1970 until 1981 and has been held most years since, except for "fallow years" taken mostly at five-year intervals, intended to give the land, local population, and organisers a break. 2018 was a "fallow year", and the 2019 festival took place from 26 to 30 June. There were then two consecutive "fallow years" due to the COVID-19 pandemic. The festival returned for 22–26 June 2022 with the headliners Billie Eilish, Paul McCartney and Kendrick Lamar. The next festival took place between 21 and 25 June 2023, headlined by Arctic Monkeys, Guns N' Roses and Elton John in his final UK performance.