I’m afraid I haven’t saved the original log, and the problematic calendar event itself is of course deleted, sorry. I can try to reproduce the issue, but I don’t have time for that right now. But I’d really appreciate it if the work put into this was focused on getting the sync to continue because there’s no way to prevent these things from happening. We have only limited control over the event’s contents, and no control at all over the server, which may return errors for the weirdest reasons.