delete-events.php

<?php
ini_set( 'memory_limit', '750M' );
if ( empty( $_SERVER['SERVER_NAME'] ) ) {
	$_SERVER['SERVER_NAME'] = 'CLI';
}

date_default_timezone_set( 'America/New_York' );

// header('Content-Type: application/json');

if ( ! defined( 'ABSPATH' ) ) {
	require_once 'public/wp-load.php';
}

$args = array(

	'post_type'   => array( 'ai1ec_event', 'post', 'event' ),
	'nopaging'    => true,
	'post_status' => array( 'publish', 'pending', 'draft', 'auto-draft', 'future', 'private', 'inherit', 'trash', 'any' ),

);

$events = get_posts( $args );
foreach ( $events as $event ) {
	echo $event->ID . PHP_EOL;
	wp_delete_post( $event->ID, true );
}