Create yearly archives for races

// template
$event_args              = array(
    'post_type'       => 'event',
    'type'            => 'yearly',
    'format'          => 'custom',
    'echo'            => 0,
    'show_post_count' => 1,
    'before'          => '--><li>',
    'after'           => '</li><!--',
);
$event_years             = wp_get_archives( $event_args );
$events                  = str_replace( $home_url, $home_url . '/races', $event_years );
$minus_post_type         = str_replace( '?post_type=event', '', $events );
$context[ 'race_years' ] = '<ul class="list-inline list-races"><!--';
$context[ 'race_years' ] .= str_replace( date( 'Y' ) . '/', '', $minus_post_type );
$context[ 'race_years' ] .= '--></ul>';

$context[ 'title' ] = post_type_archive_title( '', false );
array_unshift( $templates, 'archive-' . get_post_type() . '.twig' );

// alter query - front-end race archive lists
function alter_query_for_races( $query ) {
    if ( ! is_admin() && $query->is_main_query() && is_post_type_archive( 'event' ) ) {
        // @TODO: meta query on event date, not publication date
        $query->set( 'posts_per_page', '25' );
        if ( ! is_year() ) {
            $query->set( 'year', date( 'Y' ) );
        }

        // if ( ! is_year() ) {
        //     $query->set( 'meta_query', array(
        //         array(
        //             'key'     => '_event_start_date',
        //             'value'   => array('2017-01-01','2017-12-31'),
        //             'compare' => 'BETWEEN',
        //         ),
        //     ) );
        // }

        if ( get_query_var( 'continent' ) ) {
            $query->set( 'meta_query', array(
                array(
                    'key'   => 'idf_continent_selector',
                    'value' => get_query_var( 'continent' ),
                ),
            ) );
        }
    }
}
add_action( 'pre_get_posts', 'alter_query_for_races' );