Apply query var to a targeted query automatically

functions.php

// APPLY QUERY VAR TO SPECIFIC QUERY AUTOMATICALLY
function jess_apply_filter_automatically($query) {
   if ( is_front_page()  &&  in_array ( $query->get('post_type'), array('events') ) ) {
       $query->set('jess_random_posts', 3);
       $query->set('posts_per_page', -1);
   }
}
add_action( 'pre_get_posts', 'jess_apply_filter_automatically' );