By default Events are not enabled, because not all apps need to fire events related to roles and permissions.
However, you may enable events by setting the events_enabled => true in config/permission.php
##Available Events
The following events are available since v6.15.0:
\Spatie\Permission\Events\RoleAttached::class
\Spatie\Permission\Events\RoleDetached::class
\Spatie\Permission\Events\PermissionAttached::class
\Spatie\Permission\Events\PermissionDetached::class
Note that the events can receive the role or permission details as a model ID or as an Eloquent record, or as an array or collection of ids or records. Be sure to inspect the parameter before acting on it.