The PlayerRightClickItem Event is fired shortly before an item's functionality is fired. It is not fired if the player is targetting a block or entity. It can be canceled to prevent any other events from taking place. If the event is canceled, a specific result of allow, deny, or pass can be provided. By default, the result is pass.

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerRightClickItemEvent
You can, of course, also import the class before and use that name then.

PlayerRightClickItem Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IEventCancelable
• PlayerInteract

The following information can be adjusted in the event.

ZenGetter	ZenSetter	type
ZenGetter cancellationResult	ZenSetter cancellationResult	type string ("allow" / "deny" / "default")