Investigate whether there is an issue with timezone of Event.end
When testing !506 (merged), I got the following warning. We should look into this.
root@ivo:/etc/dockerts/beta# ./manage.py.sh sendmembershipnotification --dry-run /usr/local/lib/python3.5/site-packages/django/db/models/fields/__init__.py:1451: RuntimeWarning: DateTimeField Event.end received a naive datetime (2017-06-28 21:21:28.118351) while time zone support is active. RuntimeWarning)
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