Can we define, emit and listen to Custom Events?

Questions
2

There is no special inbuilt for custom events as every choice exercise is an event. So if you want to emit an event, you can just create a choice without an effect:

controller (signatory this) can
  nonconsuming MyEvent : ()
    with
      message : Text
    do
      return ()

If you exercise that, all you’ll get is an extra node on the transaction tree that you can react to.

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