/**
* Add ground
*
* @param Ground $ground
* @return Event
*/
public function addGround(Ground $ground)
{
$this->grounds[] = $ground;
$ground->setEvent($this);
return $this;
}
/**
* Add ground
*
* @param Ground $ground
* @return Event
*/
public function addGround(Ground $ground)
{
$this->grounds[] = $ground;
$ground->setEvent($this);
return $this;
}