public static function createPublicCalendar($container) {

		if (!$container instanceof ElggEntity) {
			return false;
		}

		try {
			$calendar = new Calendar();
			$calendar->access_id = ACCESS_PUBLIC;
			$calendar->owner_guid = $container->guid;
			$calendar->container_guid = $container->guid;
			$calendar->__public_calendar = true; // flag we can use to manipulate permissions

			$ia = elgg_set_ignore_access(true);
			$calendar->save();
			elgg_set_ignore_access($ia);

			elgg_log("Created public calendar for $container->name [$container->guid]", 'NOTICE');
		} catch (Exception $ex) {
			elgg_log($ex->getMessage(), 'ERROR');
		}

		return $calendar;
	}