From the Manage page, choose Email Attendees from the left hand navigation menu under Attendees.

Select the Create New Attendee Email button to create a new message.

Customize the From fields and select recipients for this email from the drop down menu of options.

Customize the Subject and Message fields of the email. Next, select when you would like for this email to be sent to the recipients. You can choose from the options: now, a specific date/time, or a relative date/time to the start of the event.

More Options:

Easily copy a scheduled reminder email to quickly send out the same message format. Choose the Copy link next to the completed email.

Note: This feature is especially useful to send reminder information to attendees about your event or other instructions that are pertinent to the success of your event.