code: public static function findCurrentByPid($intPid, $intStart, $intEnd, array $arrOptions=array())
  	{
  		$t = static::$strTable;
  		$intStart = (int) $intStart;
  		$intEnd = (int) $intEnd;
  
  		$arrColumns = array("$t.pid=? AND (($t.startTime>=$intStart AND $t.startTime<=$intEnd) OR ($t.endTime>=$intStart AND $t.endTime<=$intEnd) OR ($t.startTime<=$intStart AND $t.endTime>=$intEnd) OR ($t.recurring='1' AND ($t.recurrences=0 OR $t.repeatEnd>=$intStart) AND $t.startTime<=$intEnd))");
  
  		if (!static::isPreviewMode($arrOptions))
  		{
  			$time = Date::floorToMinute();
  			$arrColumns[] = "($t.start='' OR $t.start<='$time') AND ($t.stop='' OR $t.stop>'" . ($time + 60) . "') AND $t.published='1'";
  		}
  
  		if (!isset($arrOptions['order']))
  		{
  			$arrOptions['order']  = "$t.startTime";
  		}
  
  		return static::findBy($arrColumns, $intPid, $arrOptions);
  	}
docs: Find events of the current period by their parent ID
  
  @param integer $intPid     The calendar ID
  @param integer $intStart   The start date as Unix timestamp
  @param integer $intEnd     The end date as Unix timestamp
  @param array   $arrOptions An optional options array
  
  @return Collection|CalendarEventsModel[]|CalendarEventsModel|null A collection of models or null if there are no events