The PortalSpawn Event is fired when an attempt is made to spawn a nether portal. If cancelled, the portal will not be spawned.

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

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

• IEventCancelable
• IBlockEvent

ZenGetter	Type	Description
ZenGetter valid	Type bool	Description If the size of portal is valid
ZenGetter height	Type int	Description The height of portal
ZenGetter width	Type int	Description The width of portal