Sumac's Course Registration add-on lets you see who registered for a specific course or session in two ways: the Registrations View (with search filters) and the Built-in Reports.
This is the best option when you need a specific slice — e.g. "everyone registered for the Fall 2026 session of Pottery 101" or "all registrations made in the last 30 days."
From the Registration View (or Course View), expand Reports in the side panel for ready-made reports, including:
Pick the report that matches what you need, enter the session/course/date-range prompts, and Sumac will generate the list.
The History tab on a contact record shows Course Registrations entries per contact — that's a per-contact view, not a per-session view. To go the other direction (from a session to its list of registrants), use the Registration View search or the Report described above rather than browsing contact histories.