Is it possible for a classmate to "unregister" for reunion?

A few people have bowed out of attending reunion and they are still turning up on the attendee reports.

Nope, Classmates cannot unregister. You need to go in and delete them from Admin.

If I delete them from "admin" will that delete them from the whole system or just reunion?

Just reunion.

1) Click Reunion Planner
2) Click the Show Attendees link
3) Click directly on the Classmate's name
4) Click the Edit Registration button
5) Click the Delete Registration button
6) Now edit the Classmate's Profile and set their "Attending Reunion" question back to no. This will remove their attending reunion icon on the Classmate Profiles page.

Thank you! I learn something new each time I log on!