calendar.module

$header = array();
  $header[] = array(
    'data' => t('title'),
    'type' => 'property',
    'specifier' => 'title',
    'sort' => 'asc',
  );
  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type', 'node')
    ->entityCondition('bundle', 'convention')
    ->propertyCondition('status', 1)
    ->addMetaData('account', user_load(1))
    ->tableSort($header);
  $result = $query->execute();
  if (isset($result['node'])) {
    $nids = array_keys($result['node']);
    $nodes = entity_load('node', $nids);
    $rows = array();
    foreach ($nodes as $node) {
      $wrapper = entity_metadata_wrapper('node', $node);
      $rows[] = array($wrapper->label());
    }
    dpm(theme('table', array('header' => $header, 'rows' => $rows)));
  }