Hi @Kelly_Gilson. If you allowed registrants the ability to join your list when creating the registration form, only those who have opted-in have been added to a list. You can add registrants to a list but keep in mind that they have not explicitly asked to receive emails from you and there is a chance that they will unsubscribe.
In the event dashboard, there is an email template called "Follow-up message." This will be your chance to contact all of your registrants and invite them to join your email list, having the registrant opt-in themselves.
Thank you!
(On behalf of Caitlin) You're very welcome!
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