What's the distinction between a custom event defined in Functions vs the EventGraph?

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Both of these seem identical in principle but by the interface storing them in different locations suggests there might be a conceptual difference.

There are a number of things that cannot be done inside a function e.g. Timelines. For these, you will have to use Custom Events. Generally speaking - try to use Functions first. If you can’t get the nodes you need, go for Custom Events.

n.b. You can’t create Custom Events inside a Function.