Sonisphere Festival organizers announced the event to increase capacity

Sonisphere Festival organizers announced the event to increase capacity and day tickets will be put back on sale is permitted.

Sonsphere Festival headline Biffy Clyro, Metallica and Slipknot, and the event held at Knebworth Park on July 8-10.

Any additional tickets for Saturday have already been made ​​at full power is available from holiday campsite.

The Sonisphere Festival line-up so far is:

Airbourne
Alestorm
All Time Low
Amplifier
Anberlin
The Answer
Anterior
Anthrax
Arcane Roots
Arch Enemy
Architects
Bad Religion
Biffy Clyro
Black Breath
The Black Dahlia Murder
Black Spiders
Black Tide
Blood Red Shoes
Cancer Bats
Cavalera Conspiracy
Cerebral Ballzy
Cherri Bomb
The Crave
Decade
The Defiled
Demonic Resurrection
Diamond Head
Don Bronco
Exit Ten
Firewind
Flats
Fletcher
Four Year Strong
Fozzy
Gallows
Glamour Of The Kill
Gojira
Grinspoon
Hammer Of The Gods
Hayseed Dixie
Hounds
House Of Pain
In Flames
Inme
Innerpartysystem
Japanese Voyers
Jettblack
Kids In Glass Houses
Killing Joke
Kylesa
Limp Bizkit
Lower Than Atlantis
The Mars Volta
Mastodon
Me Vs Hero
Megadeth
Metallica
Mojo Fury
Motörhead
My Passion
No Americana
One Minute Silence
Opeth
Orange Goblin
Panic Cell
Paradise Lost
Parkway Drive
Periphery
Protest The Hero
Pulled Apart By Horses
Revoker
Richard Cheese
Rise To Remain
Rival Sons
Rolo Tomassi
Saint Jude
Six Hour Sundown
Slam Cartel
Slayer
Slipknot
Sonic Boom Six
Sons Of Icarus
Sum 41
Sylosis
Tek-One
Tesseract
The Safety Fire
The Sisters Of Mercy
The Treatment
Title Fight
The Virgin Marys
Turbogeist
Turbowolf
Volbeat
Watain
Weezer
While She Sleeps
You And What Army
You Me At Six
Young Legionnaire