Oxfam organises about 2,000 stewards at Glastonbury.
The aid charity recruits and coordinates volunteer stewards who help with practical work across the festival site. In return for their service, volunteers receive benefits such as festival entry, while Oxfam receives a donation from the event's organisers.
Stewarding is part of Glastonbury's wider volunteer-based structure. Although the festival employs specialist technical, medical and security personnel, much of its operation depends on unpaid workers. Oxfam's role is therefore different from simply receiving a charitable donation: it actively provides a large organised workforce.
Greenpeace and WaterAid are common alternative answers because they are also major Glastonbury charity partners and contribute features or volunteers. Shelter and WaterAid may be involved in charitable activity more broadly, but the charity specifically identified with organising roughly 2,000 festival stewards is Oxfam.