For Armin - Hide "Eintritt Frei" from event details in single event view

functions.php

<?php
/*
 * Hide "Eintritt Frei" from event details in single event view
 * Paste this to your child theme's functions.php file
*/
add_action( 'tribe_before_get_template_part', function( $tpl ) {
  if ( 'modules/meta/details.php' === $tpl ) {
    add_filter( 'tribe_get_formatted_cost', '__return_empty_string' );
  }
} );