Good evening Derek and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
The way to achieve this is to make sure that the event in question is only visible to a certain WordPress role (which would require recipients to log in) or to protect it by a password.
The good news is that there are quite a few third-party plugins out there that can help with that.
The way this works is that these plugins, here is a quick list: https://colorlib.com/wp/content-protection-plugins-wordpress/
So in short, the process would be:
- Install both the Events Calendar and Event Tickets plugins on your website
- Choose a third-party content protector plugin
- Create your event, including your RSVP ticket
- Protect your event to the desired role or the desired password
- If need be, create WordPress users with a limited role (e.g: subscribers)
- Send them snail mail including the event URL and their credentials / password
Let me know if that helps.
Have a great day!
Geoff B.