After registering for your event, your guests will immediately receive a confirmation email. If you want to re-send the confirmation emails to your guests, you can do so from Reporting > Overview.
Re-Sending Confirmation Emails In Bulk
Tick the boxes next to the names of the guests you want to re-send the confirmation email to and then click the 'Actions' button. Select 'Confirmation' and then confirm your intent to re-send the confirmation email.
Manually Re-Sending Confirmation Emails To Individual Submissions
In the expanded view of submission, locate and click on the three dots in the upper left corner and then select 'Confirmation'. Confirm your intent to re-send the confirmation email.