Planner editors

The owner of the planner is able to assign other users as editors of the planner.
Editors will be able to view who the other editors are, but cannot revoke or grant editor status.

Assigned editors

The table lists the username, with a link to their profile, for each editor.
It also include the time they were added, localised to your local time.

Assigning an editor

The planner can simply search for a username, and once found, click Add.