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Relevanssi.

Some event calendar plugins do recurring events by creating many posts. That’s fine until those cloned posts fill up your search results. This function will only show one of each post with the same title and will take the one with the first date.

The date is checked from _EventStartDate custom field, but it’s easy to change the function to look at the post publication date or something else.

Add this to your site:

add_filter( 'relevanssi_hits_filter', 'rlv_cull_recurring_events' ); 
function rlv_cull_recurring_events( $hits ) { 
  $ok_results     = array(); 
  $posts_seen     = array(); 
  $index_by_title = array(); 
  $date_by_title  = array(); 
  $i = 0; 
  foreach ( $hits[0] as $hit ) { 
    if ( ! isset( $posts_seen[ $hit->post_title ] ) ) { 
      $ok_results[]                       = $hit; 
      $date_by_title[ $hit->post_title ]  = get_post_meta( $hit->ID, '_EventStartDate', true ); 
      $index_by_title[ $hit->post_title ] = $i; 
      $posts_seen[ $hit->post_title ]     = true; 
      $i++; 
   } else { 
      if ( get_post_meta( $hit->ID, '_EventStartDate', true ) < $date_by_title[ $hit->post_title ] ) { 
        if ( strtotime( get_post_meta( $hit->ID, '_EventStartDate', true ) ) < time() ) {
          continue; // Skips events that are in the past.
        }
        $date_by_title[ $hit->post_title ]                 = get_post_meta( $hit->ID, '_EventStartDate', true ); 
        $ok_results[ $index_by_title[ $hit->post_title ] ] = $hit;
      } 
    } 
  } 
  $hits[0] = $ok_results;
  return $hits;
}

Update 27.10.2017: Fixed the function to remove an “Undefined index” error and added a check for skipping events in the past.