# beforehand
$kernel->state('event_part_two', \&task_part_two);
sub task_part_one {
  # Do some work.
  ...;
  # Ask POE::Kernel to give this session an "event_part_two"
  # event after five seconds have passed.
  $kernel->delay(event_part_two => 5);
}
sub task_part_two {
  # Do some more work.
  ...;
}