Hi Lindsay. Thanks for your question.
This isn’t possible out of the box, but you could get a developer to help with this if it’s a requirement.
You could possibly add the ticket and hide it by default and then have some JavaScript to display it if there’s a certain URL query parameter. For example: http://example.com/event/my-event-slug/?ticket720=yes
Another idea is to follow our Themer’s Guide to customize how the tickets are displayed on each Event single page.
You could even restrict it to only display if a specific user is logged in and viewing the single Event.
I hope one of these ideas helps you and/or your developer with this customization!