The Scenario
You ran a virtual event last week. Eight hundred people registered, attended, and handed over their email addresses through a sign-up form. The post-event nurture sequence is queued in Klaviyo — product demos, follow-up content, a discount for attendees who did not convert. All of it is ready to send. The only thing standing between you and the campaign going live is getting those 800 emails into the "Event Attendees 2025" list in Klaviyo.
The bad version:
- Export the registration sheet as a CSV, open the file in a text editor to check that the column headers match what Klaviyo expects, then log into Klaviyo and navigate to the list import screen.
- Upload the CSV, step through the field-mapping wizard, and discover that your "Email Address" column header does not match Klaviyo's expected "email" — rename it, re-export, and upload again.
- Wait for the import job to finish, check the success/failure summary, and manually log how many were added vs. already existed.
Nobody hired you to be a CSV reformatting technician. The sequence is sitting idle while you work through an import wizard that should not exist.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Google Sheet. It reads the registration data, understands the columns, and talks to Klaviyo on your behalf. You do not touch the import screen.
Add all email addresses in column A of this sheet to the Klaviyo list named "Event Attendees 2025", processing up to 1000 at a time and reporting how many were added
What You Get
- Every email in column A is batched into groups of up to 1,000 and submitted to Klaviyo's list-add endpoint in one or more calls.
- A summary note is written into the sheet: how many profiles were added, how many were already members, and whether any rows were skipped due to malformed addresses.
- The Klaviyo list reflects the new members immediately — the post-event sequence can trigger the same day.
What If the Data Is Not Quite Ready
The "VIP" rows need to go to a different list
For all rows where column C says "VIP", add those emails from column A to the Klaviyo list with ID abc123; add everyone else to the list named "Event Attendees 2025"
Phone numbers are in the sheet but formatted inconsistently
Add emails from column A to Klaviyo list "Event Attendees 2025" — column B has phone numbers but they are in mixed formats like +1-555-123-4567 and (555) 123 4567; normalize each to E.164 format before setting the phone_number property on each profile
Attendees are split across two tabs
Combine the "Day 1" and "Day 2" tabs — both have email in column A — and add all unique emails to the Klaviyo list "Event Attendees 2025", deduplicating by email before the import
Full cleanup and segmentation in one shot
For all rows in this sheet, normalize the email in column A to lowercase, deduplicate, then add rows where column C is "VIP" to Klaviyo list "VIP Attendees" and all other rows to "Event Attendees 2025", writing the assigned list name into column D for each row
The pattern: instead of cleaning the data first and then importing, you ask for both in one prompt. SheetXAI handles the conditional thinking inline.
Try It
Get the 7-day free trial of SheetXAI and open the Google Sheet where your event sign-up data lives, then ask it to push those subscribers into the right Klaviyo list. You can also check out how to export campaign performance metrics or the Klaviyo integration hub.