Google Calendar New event from search ends. Mailchimp Add new subscriber.

When a Google Calendar event has ended, add the attendee to my Mailchimp mailing list

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This applet will help you keep your mailing list up to date and easily manage your contacts. When a Google Calendar event ends, the applet will automatically add the attendee's email address to your Mailchimp mailing list. Note: this only applies to meetings with a single attendee.