While hundreds of acts have already been confirmed for Glastonbury Festival, organisers still have a few surprises up their sleeve.
There are a number of 'secret sets' every year, with the acts only getting confirmed a few hours before they take to the stage.
In recent years there have been secret slots from The Killers on the John Peel stage while Foals and Bastille were also among acts kept under wraps.
This year the biggest special guests are likely to perform on the Sunday, with TBC slots on both the John Peel and The Park stages.
Here's what we know so far...
When are the main unannounced secret slots at Glastonbury Festival 2022?
John Peel Stage, 2pm-3pm on Sunday
The Park Stage, 6.15pm-7.15pm on Sunday
Glade Stage, 0.10am-1.30am on Monday
Arcadia, 11pm on Friday - 1am on Saturday - Chemical Brothers confirmed
William's Green, 7.45pm-8.25pm on Thursday
William's Green, 9pm-10pm on Thursday
BBC Introducing Stage, 7.55pm-8.55pm on Friday
BBC Introducing Stage, 1pm-1.30pm on Saturday
BBC Introducing Stage, 7.15pm-7.45pm on Saturday
BBC Introducing Stage, 7.45pm-8.15pm on Sunday
Who is rumoured to perform a secret set at Glastonbury Festival this year?
So far Green Day, George Ezra and the Chemical Brothers are some the main rumours for secret sets alongside Harry Styles and Florence and the Machine.
The huge band famous for hits like American Idiot and Basket Case seem to be a likely candidate for a secret Sunday slot at Glastonbury Festival 2022.
The band are touring the UK at the end of June but are not scheduled to play anywhere on Sunday 26 June.
The band are touring with Amyl and the Sniffers, who are scheduled to perform on the John Peel Stage on the Sunday of this year's festival. It is likely the bands will share a production crew, adding more fuel to the rumours.
Fans of the festival are convicted George Ezra is going to play the 2pm secret slot on the John Peel stage on the Sunday of this year's festival.
It comes after illustrator @gretasletters, who has been painting signs for the Glastonbury site, posted a sign to their Instagram stories saying "Gold Rush Kid - 2pm, John Peel Stage".
Gold Rush Kid is the title of Ezra's third studio album, which was released earlier this month.
The Chemical Brothers have confirmed themselves for the secret slot at Arcadia after being rumoured for weeks.
The electronic duo are no stranger to Glastonbury, having played at the most recent festival in 2019 when they headlined the Other Stage on the Saturday.
Rumours first started when fans spotted a gap in their tour dates which is a perfect fit for the Arcadia slot and also posted on Instagram about their "brand new intense show", adding: "We’re ready for the summer, see you in a field soon."
They further added fuel to the rumours after re-tweeting a Glastonbury fan account mentioning they were tipped to perform.
Harry Styles was initially rumoured to be a headliner but when the line-up for Glastonbury Festival 2022 was announced his name was missing from the bill.
However there is still a gap in his UK tour dates when the festival is on. He is due to perform in Dublin on June 22 - the day the Glastonbury gates open - before a gig in Hamburg on the Sunday of the festival on June 26.
While that gig rules him out for the 6.15pm secret slot on the Park Stage, fans remain hopeful he could make a quick appearance from 2-3pm in the John Peel tent before jetting off to Germany.
Florence and the Machine
Previous headliner Florence and the Machine is rumoured to take up one of the secret sets. She is currently on a European tour and is set to perform in Belgium in the middle of Glastonbury Festival, on Saturday 25 June.
But the artist then has a gap in her tour dates until July 7, sparking rumours she could return to the UK in time for a performance on The Park stage at 6.15pm on the Sunday of this year's festival.
The pop-rock band played at Glastonbury in 2019, but so far aren't on the bill for this year's festival.
But after lead singer Dan Smith 'liked' a fan's post speculating they will appear at Williams Green on Thursday night, there are plenty of rumours they could be back at Worthy Farm once again.