Several WWE (World Wrestling Entertainment) superstars will be making appearances on this year's Ozzfest tour.To view the current appearance schedule, click here. WWE is one of the sponsors of the 2007 Ozzfest, which is the first time the event will be held as a free show. Earlier in the month, tickets for all 24 shows were distributed to a frenzy of music fans. More than 428,000 tickets in all were given away through LiveNation.com, marking the largest number of free tickets distributed in the United States in the history of the concert business. In a staged release and via various sponsor sites, including Monster Energy, Jägermeister, FYE, Pilgrim Films, Hustler Lingerie and WWE, LiveNation.com enabled fans to enter exclusive codes to obtain tickets beginning Friday, June 8. More than 228,000 tickets were distributed on June 12 alone, with the last ticket given away just after midnight. The tickets were completely free without surcharges of any kind.