The EntityMount event is fired whenever an entity is mounted or dismounted from. If canceled, the entity is prevented from mounting (or dismounting).

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

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

• ILivingEvent
• IEventCancelable

The following information can be retrieved/set during the event:

ZenGetter	Возвращаемый тип
ZenGetter world	Возвращаемый тип IWorld
ZenGetter mountingEntity	Возвращаемый тип IEntity
ZenGetter mountedEntity	Возвращаемый тип IEntity
ZenGetter isMounting	Возвращаемый тип boolean
ZenGetter isDismounting	Возвращаемый тип boolean