Hey @DSI75865 - great question! Thanks for posting this topic, and welcome to Calendly Community! 

At this time there is no way to send emails (or any correspondence) to your invitees via Calendly itself, outside of those invitees with upcoming bookings. Workflows are attached to upcoming bookings (to include follow-up Workflows you can set up to send after a booking has taken place). 

If you’d like to email all of your former invitees, here’s what I’d suggest: 

1. Export your past invitee data - you can do this by heading to your “scheduled events > past” tab and clicking the “export” button

   

    
2. Use the data from this export in a CRM like Hubspot or Salesforce to send out a mass email, or
3. Use the data from this export to send out an email from your own email provider (Gmail, for example)

I know this isn't exactly what you wanted to hear but do hope the information helps, at least somewhat! Don’t hesitate to come back with more questions - we love to answer them!

p.s. check out our New User Guide - it’s super helpful when you are new!

Thank you :)

You’re so welcome! I hope you have a great night - and that the info helped!