As the subject states. I’ve checked the Event UI, Communicate UI, the help docs, and support forum. If there isn’t a way to do this, my FR is a button in the Event interface that performs an “Email to RSVP YES Respondents” is what I’d like.
You’ll need the Manage Events Privilege. There’s a button on the event page.
Calendar Email Invitees Attendance Actions
That allows you to:
Send message to all recipients who have RSVP’d with the following:*