Change the required fields in the Community Events submission form.

functions.php

<?php
// Change the required fields in the Community Events form. This code is setting only the Event Title 
// as a required field in the submission form. You can customize it the way you want. 
// You will find the default event fields in the following link: 
// https://theeventscalendar.com/knowledgebase/required-fields-for-events-submission-form/#default-fields

add_action( 'tribe_events_community_required_fields', 'my_community_required_fields' );

function my_community_required_fields( $required_fields ) {

	$required_fields = array(
		'post_title',
	);

	return $required_fields;
}