This is another tricky one. If you try to modify the list of participants and then Save, sometimes it doesn't save the list and comes back with the same participants as before.
We should fix this, asap.
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The issue was we weren't trying to find participants by user ID and event, so you couldn't add participants that were also part of another event. Surprised it took us this long to notice that bug! 10f38f7 should fix it.