Hello,
Sure thing! You can edit the email template by following these instructions. The file can be found at wp-content/plugins/event-tickets/src/views/tickets/email.php.
If you want to include different information depending on the event, I would recommend using the custom fields that come with Pro. This post has an example on how to add these to the email. You could then add some custom CSS to hide theme from the front end if you would like.
We are a bit limited in the amount of support that we can provide for customizations like this, but if you get stuck or have any questions, please let me know! I’ll be happy to point you in the right direction.
Thanks,
Jennifer