Casa de la Amistad supports underprivileged children ́s fight against cancer. One way to help this cause is by donating hair. That being the case, the goal was to collect as much hair to make wigs that, in return, help restore the children ́s self-esteem and confidence. The strategy was to talk to an ideal donor that nobody had spoken to: the metalhead, since their hair is more than 25 cm and has no dye. With them in mind, we created The Hair Fest, the first festival where the ticket was hair. The festival played nine Mexican metal bands and lasted 8 hours. The box office sold out within 2 hours of opening.