public function isDuplicated(ISummit $summit)
 {
     $start_date = $summit->getBeginDate();
     $end_date = $summit->getEndDate();
     $dupe = Summit::get_one("Summit", "Name = '" . $summit->getName() . "' AND SummitBeginDate = '" . $start_date . "'  AND SummitEndDate = '" . $end_date . "'");
     return !empty($dupe);
 }