Hi,

This will help you to get started:

Since we'll place a new admin page in the calendar we'll use only the calendar plugin folder.

Open the main calendar file stachethemes_event_calendar.php and register new admin menu Orders by adding this line at the very bottom:

add_action('stec_add_admin_menu', function(){
    $stachethemes_ec_main = \Stachethemes\Stec\Stachethemes_Event_Calendar::get_instance();
    $stachethemes_ec_main->add_submenu('Orders', 'stec_menu__orders');
});

Then unzip the archive I've attached and place the orders folder in

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Now you will have new submenu STEC -> Orders.

The orders folder contain two files index.php and list.php .

The index.php retrieves all orders that contain tickets in them and then displays the list.php file. 

You will want to start working with list.php .

It already contains orders loop. I hope you get the idea what's going on there.

For the meta data I'd suggest you to include this function in the list.php file.

function get_ticket_meta_value($key, $ticket_data) {
    foreach($ticket_data['meta_data'] as $meta) {

        if ($meta->__get('key') !== $key) {{
            continue;
        }}
        return $meta->__get('value');
    }
    return '';
}

It's a helper function  to obtain the meta value by key name.

And then inside the loop you get the meta value like this:

$event_date = get_ticket_meta_value('event_start', $ticket_data);

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Obtaining customer name from the $order:

$customer_name = sprintf('%s %s', $order->get_billing_first_name(), $order->get_billing_last_name());