Organizers can cancel a reunion up until the event starts. Once a reunion's date has passed, its details are frozen and it cannot be deleted or cancelled. When a reunion is cancelled, all details and associated content will be removed. This includes all photos, even if you're not the one who posted them.
To cancel a reunion you've created, go to your event page and click Delete event below the event name. Click Yes to confirm. All invitees will receive an automatic notification letting them know the reunion is no longer being planned with Classmates®.