No emails can be sent until you publish your event.
Invitations will be automatically sent when your event is published, unless you choose to have them sent on another date.
Registration reminders will be sent 2 weeks after the invitations are sent, unless you choose to have them sent on another date.
You can also choose to send event reminders to your registrants 7 days or 2 days prior to the event date (or both).
Finally, you can send follow up emails (“thank you for coming” or “sorry we missed you”) at 9AM two business business days after the end of your event.