Filtering posts for unique titles, only the most recent

You can try this. However, I am sure there must be a better alternative..

$past_events = get_posts(array(
    'post_type' => Tribe__Events__Main::POSTTYPE,
    'paged'     => $paged,
    'posts_per_page' => '10',
    'eventDisplay'=>'past',
    'orderby'=> 'title',
    'order' => 'ASC',
    's' => $searchText ?: '',
));

$post_arr = array();
foreach ( $past_events as $past_event ) {
    $post_arr[ $past_event->post_title ] = $past_event->ID;
}  

$post_arr will now contain the title of the latest post containing same title as key and the post id as value.