Howdy Kam,
You can adjust the date format settings calendar wide in WP-Admin > Events > Settings > Display. That would be the Date with year format. Or, if you only want to change the format for that one date, you could do so by creating a theme override for /the-events-calendar/src/views/tickets/email.php Details on creating theme overrides can be found in our Themer’s Guide. However, creating a theme override does require a decent knowledge of PHP and WP Themes.
Does one of those options fill your needs?
Cheers!
– Brook