Modified version of Tom's code

function mlgma_my_get_posts($query) {
    // Don't modify the query on an events page
    if (array_key_exists('eventDisplay', $query->query_vars)) return $query;

    if (is_home() && false == $query->query_vars['suppress_filters'])
        $query->set('post_type', array('post', 'Newsletter', 'attachment', TribeEvents::POSTTYPE));
    return $query;
}

add_filter('pre_get_posts', 'mlgma_my_get_posts');