Hi FirstNameL158536!
Thanks for reaching out to the Community!
I recommend uploading your file of registrants into a list in your Constant Contact account and title it something like Event Name - Registrants.
On the last step of the import process you can add a tag. Call the tag something similar ex: Event Name - Registrants.

When you are ready to send your campaign: Filter a List by Tags While Scheduling an Email
- Select the list(s) you want to send to
- Click Narrow by Tag
- Select the option to Don't send to contacts who are also tagged with
- Select your registrants tag
- Apply filter
- Send
If you would like a complete walkthrough of this process please give our Support team a call at 866-289-2101. They can even share your screen to show you where to click!
Kara.D
Community & Social Media Support
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