.hidden {
  display: none;
}

.show_program_button {
  display: block; /* none/block */
}

.show_agenda {
  display: block; /* none/block */
}

.show_keynotes {
  display: block; /* none/block */
}

.show_bestpaper {
  display: block; /* none/block */
}

.show_social {
  display: none; /* none/block */
}

.show_attend_button {
  display: block; /* none/block */
}

.show_registration {
  display: block; /* none/block */
}

.show_venue {
  display: block; /* none/block */
}

.show_travel {
  display: block; /* none/block */
}

.show_cameraready {
  display: block; /* none/block */
}

.show_specialsession {
  display: block; /* none/block */
}

.show_tutorial {
  display: block; /* none/block */
}