Combine tax_query and meta_query in WP_Query()

single-author.php

<?php
/**
 * This is a kind of rare combination of arguments for WP_Query(), needed in some very special cases.
 * This is an already tested snippet code that works!
 */

// Bring post from the global context (if not present already).
global $post;
// Define the post_type's to query for.
$post_types = array( 'event', 'post', 'book' );
// Do the weird query. Play with, or add arguments as needed https://codex.wordpress.org/Class_Reference/WP_Query
$results = WP_Query(
		array(
			'post_type' => $post_types,
			'tax_query' => array(
				array(
					'taxonomy' => 'category',
					'terms' => wp_get_post_categories( $post->ID )
				)
			),
			'meta_query' => array(
				'relation' => 'OR',
				array(
					'key'     => 'presenters_people',
					'value'   => $post->ID,
					'compare' => 'LIKE'
				),
				array(
					'key'     => 'author',
					'value'   => $post->ID,
					'compare' => 'LIKE'
				)
			)
		)
	);