Aerial view of the sprawling tent city which has arisen from the Somerset countryside for the Glastonbury Festival, June 25 2015. See SWNS story SWGLASTO; With a population bigger than Bath, Reading and Oxford, 175,000 revellers have crammed into the 900-acre Worthy Farm for the five-day event, which will play host to more than 2,000 acts across dozens of stages. An army of 40,000 security guards, litter pickers, stewards, volunteers and retailers will also spill onto the site over the next few days.