function default_columns( $apm ) {
        global $ecp_apm, $post;
        if ( $ecp_apm === $apm ) {
            // Fallback is the order the columns fall back to if nothing was explicitly set
            // An array of column header IDs
            $ecp_apm->columns->set_fallback(array('title', '_ecp_custom_1', 'ecp_organizer_filter_key', 'ecp_venue_filter_key', 'events-cats', 'recurring', 'start-date', 'end-date'));
        }
     }