noindexevents.php

<?php

// only no index all events archived

add_action('wp_head', 'no_index_event_archives', 10, 3);

function no_index_event_archives() {
  if ( ! is_post_type_archive('tribe_events') ) 
    return;
  
  echo '<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">';

}

// only no index past event archives

add_action('wp_head', 'no_index_paged_event_archives', 10, 3);

function no_index_paged_event_archives() {
  if (is_post_type_archive('tribe_events') && is_paged() ) {
    echo '<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">';
  }
}