SpreadPlayersCommandTeleportEvent is fired before a living entity is teleported by the spread players command.

The event is cancelable.

If the event is canceled, the teleport won't happen.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.event.living.teleport.SpreadPlayersCommandTeleportEvent;

SpreadPlayersCommandTeleportEvent extends EntityTeleportEvent. That means all methods available in EntityTeleportEvent are also available in SpreadPlayersCommandTeleportEvent