Riot Fest 2012 is going to be a major bash. Organizers have just announced a slew of new additions to the bill, which will make the inaugural try of hosting an outdoor event one for the ages.

The latest additions include Andrew W.K., Dead Sara, Hot Water Music, Imagine Dragons, Neon Trees, the Adicts, Minus the Bear, Pegboy and more. They join a bill that already featured headliners the Offspring, Rise Against and Iggy and the Stooges, plus Gaslight Anthem, A Day to Remember, Elvis Costello, Dropkick Murphys, Coheed and Cambria, the Descendents, and more.

Single day tickets are currently on sale here, with only a few 2-day and 3-day passes remaining. VIP passes are also available at the Riot Fest Chicago website.

The music weekend runs Sept. 14-16 and will take place at both the Congress Theater on opening day and later at the Humboldt Park grounds in Chicago. The full daily rundown can be seen below.

There are also Riot Fest events being staged in Philadelphia (June 19, Festival Pier at Penn's Landing), Brooklyn (Sept. 8, Williamsburg Park), Toronto (Sept. 9, Fort York: Garrison Commons), and Dallas (Sept. 22, Gexa Energy Pavilion).

Friday, Sept. 14 (Congress Theater)

The Offspring
Neon Trees
Pegboy
Dead Sara

Saturday, Sept. 15 (Humboldt Park)

Rise Against
Descendents
Coheed and Cambria
Dropkick Murphys
Gaslight Anthem
Slapstick
Hot Water Music
Andrew W.K.
Minus the Bear
Less Than Jake
GWAR
August Burns Red
Frank Turner
The Adicts
Nobunny
A Wilhelm Scream
Teenage Bottlerocket
Screaming Females
Off With Their Heads
Deals Gone Bad
Larry and His Flask
The Story So Far
Environmental Encroachment
Fireworks

Sunday, Sept. 16 (Humboldt Park)

Iggy and the Stooges
Elvis Costello
A Day to Remember
Gogol Bordello
NOFX
Alkaline Trio
Jesus and Mary Chain
AWOLNATION
The Promise Ring
Chiodos
Built to Spill
Imagine Dragons
Reverend Horton Heat
Fishbone
Screaming Females
White Mystery
The Henry Clay People
Sister Crayon
Japanther
The Infected
Environmental Encroachment

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