Fans get ready for T In The Park By Steve Holden Newsbeat entertainment reporter Mumford & Sons bassist Ted Dwane has been released from hospital Thousands of music fans are preparing to see Mumford and Sons, Rihanna and the Killers at this year's T In The Park . The festival, Scotland's largest, is celebrating its 20th anniversary Up to 250-thousand people are expected to descend on Balado Airfield in Kinross-shire over the course of the weekend. Kendrick Lemar, Everything Everything, Jake Bugg y and Rudimental are among the acts due to perform on day one. Milestone Festival director Geoff Ellis said: "It doesn't feel like 20 years since we started and it's a milestone. It's about making this year's event the special one. Pamela Beck , Megan Fenton and Victoria Fenton 18-year old Megan Fenton from Stonehaven has come with her best friend Pamela. She said: "I'm a great camper. I don't care how I look, I get sweaty, but it doesn't matter because you get to have a good time. I'm looking forward to seeing Mumford and Sons, Jake Bugg and the Fratellis. I really want to see Kesha but no-one will come to see her with me! Mumford headlines Music wise, Mumford and Sons' headline set comes just weeks after they closed Glastonbury festival. Scottish acts performing on Friday include Emeli Sande, The Proclaimers, Texas and Calvin Harris. The DJ, who's headlining the Radio 1 stage, is appearing at the festival for the fifth year in a row. HAIM, Imagine Dragons and Of Monsters And Men will also perform during the day. Police warning Meanwhile, doctors have been concerned about music fans taking fake ecstasy this weekend, which has been linked to the deaths of seven people. Superintendent Rick Dunkerley from Police Scotland told Newsbeat: "There's concern about Green Rolex tablets but there are concerns about other tablets too, some with a Mitshubishu sign on, some with stars. Our message is don't do it. Superintendent Rick Dunkerley from Police Scotland We're taking a lot of action and effort into making sure people are safe. There's a particular focus on this issue this year. We have amnesty bins and then beyond that we have a line of police with drugs dogs. We will do anything it takes to make sure people are aware of that lethal danger.