Reminders are sent via a cron job for the moment (might be worth looking at http://packages.python.org/APScheduler/ ), we should document this as it is not yet part of our documentation.
Fixed in http://git.fedorahosted.org/cgit/fedocal.git/commit/?id=cef2f1a49dd6546f840324faae4d00a6df076e7f
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