[8] In the early 2000s, artists and bands including Slipknot, Kittie, Pantera, Marilyn Manson, Mudvayne, Godsmack, Rob Zombie, Incubus, Linkin Park,[9] System of a Down, Chevelle, P.O.D., Papa Roach and Disturbed played the yearly music festival.

The person who prevailed as the winner and guaranteed his band's spot on the Ozzfest tour was Marc Serrano from metalcore act A Dozen Furies.

At Iron Maiden's last Ozzfest performance, on 20 August 2005 at the Hyundai Pavilion at Glen Helen in San Bernardino, California, several detrimental events took place.

"[14] Rod Smallwood, manager for Iron Maiden, issued a statement shortly after the debacle condemning the attack on the band.

"[17] Tickets were made available through sponsor websites, the Ozzfest web site and to those buying an advance copy of Ozzy Osbourne's new release, Black Rain.

[20] Questions over whether the event would be held in 2008 began when in April that year Ozzy Osbourne announced that he would be headlining the Canadian Monsters of Rock festival.

[24][25] The Canadian Version of "The Monsters of Rock" was held exclusively on 26 July 2008 at the McMahon Stadium located in Calgary, Alberta, Canada.

The following bands preceded the two main attractions: Serj Tankian, Hatebreed, Cavalera Conspiracy (featuring current frontman of Soulfly, and former frontman of Sepultura, Max Cavalera), Shadows Fall, Canadian metal unit Voivod, Testament, 3 Inches of Blood, Priestess, Zimmers Hole, and Dillinger Escape Plan.

Ozzy Osbourne, Mötley Crüe, Halford, DevilDriver, Nonpoint Black Label Society (cancelled in Mansfield & Camden and Bristow due to inclement weather), Drowning Pool (canceled in Mansfield due to inclement weather, Kingdom of Sorrow (Exodus played instead on the San Bernardino date), Goatwhore (canceled on the Hartford date due to a medical emergency with their bassist), Skeletonwitch, Saviours, Kataklysm (canceled in Mansfield due to inclement weather), California Wildebeest (San Bernardino date only), Immune (San Bernardino date only).

[citation needed] The guitar prodigy Yuto Miyazawa was invited by Ozzy to play "Crazy Train" at the event.

[citation needed] On 19 October 2012, it was announced that Ozzfest will be revived on 11–12 May 2013 at Makuhari Messe in Chiba, Japan; this was the first time the festival took place in that country.

[27][28] Acts confirmed for the Ozzfest Japan include Slipknot, Slash featuring Myles Kennedy and The Conspirators, Deftones, Black Sabbath, Tool and Stone Sour.

Acts that played at Ozzfest Japan include Ozzy and Friends, Korn, Evanescence, Jane's Addiction, Bullet for My Valentine, A Day to Remember, Hatebreed, Black Label Society, Corey Taylor, Crossfaith, and Babymetal.

Geezer Butler, Tom Morello, Dave Navarro, Zakk Wylde, and Funassyi appeared as guests of Ozzy and Friends.

The event was hosted by Ozzy Osbourne, Marilyn Manson, Rob Zombie, Jonathan Davis of Korn, and Body Count.