Clear things from the WooCommerce cart the first time you visit a page

clear-woocommerce-cart-on-a-specific-page-first-time-you-visit.php

// This would go in your functions.php file

// Clear things out of the cart the first time you visit a specific page (only run this script once)
add_action( 'template_redirect', 'clear_cart_items_custom_checkout' );
function clear_cart_items_custom_page() {
    global $post;
    $slug = $post->post_name;
    if($slug == 'exclusive-invitation') { // Replace this with the Slug of the page you want to clear the cart on
        global $woocommerce;
        $woocommerce->cart->empty_cart();
    }
}

// Make sure the script to empty things from the custom checkout page cart is only run once
add_action( 'init', 'my_run_only_once' );
function my_run_only_once() {
    if (did_action('init') >= 2 )
        return;
    if(! get_option('run_create_vip_order_once')) {
        clear_cart_items_custom_page(); // Run the function
        update_option('run_create_vip_order_once', true);
    }
}