Agree with Sanford here, I don't think the reminder email makes sense since they did not technically register for the webinars. It should be a post-webinar campaign where you handle your attended and no-show campaigns. Assuming you "register" them, their status will auto update to "no-show" after the webinar has concluded and you can target them that way. Just be careful to differentiate these users from the ones that actually registered and did not attend.
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