These docs are for an old release.
Info on upgrading to v4
Dragging and Resizing before v2.1.0
For FullCalendar version 2.1.0 and above, you don’t need any external dependencies for event drag-and-drop and resizing. However, in versions 2.1.0 and below, you’ll need certain jQuery UI modules:
These modules can be conveniently bundled/compressed/downloaded at the jQuery UI downloads page.
After you have gathered the dependencies, you still need to enable dragging/resizing by settings the editable option to true.
Mobile Support
Since this library utilizes jQuery UI, which doesnt support touch events, you’ll have to use an external library such as Touch Punch to enable touch device support.