Filter for Upcoming Event

Condition: Display all upcoming event items

<?php
add_action( 'events_filter', function( $query ) {
    
    // args
    $args = array(
        'numberposts'    => -1, // -1 means Unlimited Post
        'post_type'        => 'event', // CPT machine name
        'meta_query'    => array(
            array(
                'key'        => 'start_date', //ACF field
                'value'        => date('Y-m-d',strtotime("today")), // Time base of comparison
                'compare'    => '>=', //Show only events today and future
                'type'      => 'DATE' // Type of field
            ),
        )
    );

    $query['meta_query'] = $args;
    return $query;        
} );

?>

Filter per Taxonomy

<?php
// Showing taxonomy post list (￣▽￣)ゞ
add_action( 'taxo_filter', function( $query ) {
    
    $tags = get_queried_object()->term_id;

    // Specific Taxonomy Query
    $taxquery = array(    
            array(
                'taxonomy' => 'custom_posttype', //CPT post type
                'field' => 'id',
                'terms' => array($tags)
              //  'operator'=> 'NOT IN' // In case I need to omit something
            )
        );
    $query['tax_query'] = $taxquery;
    
    return $query;
                
} );


// Fetch the custom post type tags

add_action( 'pre_get_posts', 'wpa_cpt_tags' );

function wpa_cpt_tags( $query ) {
    if ( $query->is_tag() && $query->is_main_query() ) {
        $query->set( 'post_type', array( 'post','additionalTaxonomy' ) );
    }
}

?>