In 1999 Stephen Klingenberger saw 20 performances during 1 concert with 20 bands at 1 venue in 1 location.

Date Concert Venue Location
Jul 24, 1999
Ozzfest 1999
System of a Down / Slipknot / Deftones / Ozzy Osbourne / Pantera / Rob Zombie / Black Sabbath / Slayer / Godsmack / Primus / Static-X / Fear Factory / Soulfly / (hed) p.e. / Puya / Drain STH / Apartment 26 / Pushmonkey / Flashpoint / Shovel
  Setlists
Glen Helen Amphitheater San Bernardino, California, United States