<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_place_before">
        <observer name="amasty_order_place_validate" instance="Amasty\Deliverydate\Observer\Order\Place\Before" />
    </event>
</config>