Good afternoon Chloe and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
This is a great question. The short answer is that unfortunately, there is currently not an option to do that built-in.
But with some customization, I am pretty sure that would be possible.
You might want to read our Themer’s guide to get a sense of how that works.
As a starting point for that customization, we do have a plugin that notifies the Event Organizer every time there are new attendees: plugin
With that in mind, I can totally see how this would be a cool feature to have. In fact, you can suggest it or cast your vote on other features in our User Voice forum.
Have a good week-end,
Geoff B.