These docs are for an old release.
Info on upgrading to v4
editable
Determines whether the events on the calendar can be modified.
Boolean, default: false
This determines if the events can be dragged and resized. Enables/disables both at the same time. If you don’t want both, use the more specific eventStartEditable and eventDurationEditable instead.
This option can be overridden on a per-event basis with the Event Object editable property. However, Background Events can not be dragged or resized.
View a demo with a calendar’s events being editable.