plugin:Events-Manager Show Recurring Evnts Once

function em_get_events_list_shortcode_all($atts, $format='') {
    $atts = (array) $atts;
    $atts['format'] = ($format != '' || empty($atts['format'])) ? $format : $atts['format'];
    $atts['format'] = html_entity_decode($atts['format']); //shorcode doesn't accept html
    $atts['page'] = ( !empty($atts['page']) && is_numeric($atts['page']) )? $atts['page'] : 1;
    $atts['page'] = ( !empty($_GET['page']) && is_numeric($_GET['page']) )? $_GET['page'] : $atts['page'];

        // get recurrence events
        $atts['recurring']=1;
        $evts_recurring=EM_Events::get($atts);

        // get non-recurrence events
        $atts['recurring']=0;
        $evts=EM_Events::get($atts);
        // filter out the events that are instances of recurring events
        $non_recurrence_evts = array_filter($evts,'is_no_recurrence');

        // merge recurrence and non-recurring events
        $evts_all= array_merge($non_recurrence_evts,$evts_recurring);
        // sort them by start==start date+time
        usort($evts_all,'evt_start_sort');

        //
    return EM_Events::output( $evts_all, $atts );
}
add_shortcode ( 'events_list_all', 'em_get_events_list_shortcode_all' );

function is_no_recurrence($evt) {
    return $evt->recurrence_id == null;
}

function evt_start_sort($evt1, $evt2) {
    return $evt1->start > $evt2->start;
}