To edit the invite go to Emails -> Invite. Then go to Attendees -> Invite/Import when you're ready to send it. There you can invite one person or a entire list in one go. Be sure to use a list that is up to date since you might get a spamwarning if you send out e-mail to too many inaccurate addresses.

It is a good idea to send a test email to yourself before inviting guests, which you can do when you edit the "Invite" email.

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