Calendar Manage Events is located under My Calendar > Events > Event Groups.
Creating Groups
Event groups are automatically created when you use the ‘Add Copy’ button during the event creation process. Event copies are individual events that are created with the same descriptions and other details but unique dates and times. They are added to a group, so that common fields can be edited simultaneously.

Groups can also be created in the Event Groups interface.

Event Groups will also show all the events. This screen makes it possible to group events together or remove events from existing groups. The list can be filtered to view only Grouped Events or only Ungrouped Events, to help narrow your query.
You can sort the events by ID, Group, Title, Location, Date/Time, Author or Category.
Hovering an event that is grouped will show these quick edit options.

Editing a Group
Editing a group will make adjustments to all the events in the group. If you edit a shared field in the Group Editor, all selected events will have that edit applied. The notifications for editable fields will let you know whether all events have the same data for the field. If they don’t, you may want to review the individual events to see what is different.

Remove checked events from this group
At the top we can remove events from the group. Which means one can edit an event without it affecting the other events in the same group. This will fully remove the event from the group.
Editable fields for the events in this group match.
The following fields seen are used by all the events in the group. Apply changes to: Check or uncheck specific events you want to adjust. This will prevent this change from applying to those events without removing it from the group. After the edit, the notification will indicate that the shared fields no longer match.
Selected dates are a single multi-day event.
Clicking the checkbox will create an association for upcoming events creating a visual on the front end that these are linked.