Add multi-session event registrants to course mailing list

Your multi-session registrations sometimes arrive unprocessed, leaving attendees without welcome details. They go onto your training mailing list so coordinators can send onboarding same day.

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Overview

When registrations never make it to your mailing list, coordinators scramble and attendees miss pre-course instructions. This flow subscribes and tags every multi-session registrant so program coordinators can send onboarding and session details same day.