Add new event attendees to seasonal mailing list

Workshop registrations lack season tags, causing missed pre-event messages. This adds event and season tags so campaign managers can email attendees same day.

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Overview

When attendee registrations arrive without season context, your campaign managers can't reliably send targeted pre-event content and instructors miss important attendee notes. This workflow captures registrations, tags them by event and season, and updates mailing lists so teams can email attendees the same day.