For an example, you can use the ‘Send Global Event Float’:
In FlowScript instead of using ‘Custom Event’, use the node ‘Custom Event (T) -> System -> Float’:
The above will print 13.5 when the event is triggered in Slate.
So basically, you just need to use the (T) version of the Custom Event node in FlowCanvas, where T is the type of the data the Slate event is sending. If you were using the ‘Send Global Event Bool’ for example, then you would also need to use the ‘Custom Event (T) -> System -> Boolean’ as well.
Let me know if that is what you mean, or something different.