In 1999 Helder saw 15 performances during 1 concert with 15 bands at 0 venues in 1 location.

Date   Concert   Venue   Location  
Jul 16, 1999 –
Jul 18, 1999
T99 1999
Metallica / Aerosmith / Stereophonics / Garbage / The Black Crowes / Ministry / Monster Magnet / Zucchero / Guano Apes / Swell / Rollins Band / mercyful fate / Ramp / Anger / Repórter Estrábico
  Setlists
Lisbon, Lisbon, Portugal