Actually.Zach has 2 Hellogoodbye concerts.

Hellogoodbye is a pop band, formed in Huntington Beach, California in 2001. They were signed to Drive-Thru Records where they released an EP, CD, and a DVD. Their first full-length album entitled Zombies! Aliens! Vampires! Dinosaurs! was released in August 2006. They are renowned for their DIY ethic, their shrill outfits and having a particularly close relationship with their fans. The band achieved fame due to their appearances on MTV's The Real World: Austin and winning MTV2's Dew Circuit Breakout.