OK. Let me explain why I'm asking by a simple (albeit a bit limited, I admit) analogy. Let's assume we're talking about cars and you've only ever driven a particular brand of car which requires removal of the wheel arch just to get access to the headlight bulb. So you suddenly bought a modern car with LED headlamp and come to the forums to ask "how to remove the wheel arch so I can replace my headlight bulb?". And we're telling you that this is no longer that car you drove for many years and you don't have to remove the wheel arch. And furthermore, it's a LED lamp so you have no bulbs to change. So in that case the problem to resolve is not "how to remove the wheel arch" but "what to do about dim headlight". Which is a completely different problem. In your case, you're trying to get some report from your events - that's your basic need. Not the join command in itself. The join command is just a tool or a step in the way (just like removing that wheel arch).
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