Good evening Brian and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
How does this work and what type of sites does it work for currently?
This option allows you to import events from another site that has the Events Calendar.
All you need to do is input the URL to that site’s events page.
You also need to make sure that both sites have roughly the same version of the Events Calendar plugin installed.
Let me know if that helps.
Have a great day!
Geoff B.