Special events are not present in exported schedule

[felixc]

The current data export feature produces a file that should have the schedule details for special events, but at present it is empty. This appears to be because the events haven't been input as "special events" per se, but rather just as static CMS pages with the information on them (for example, https://us.pycon.org/2016/admin/cms/page/79/ for the Opening Reception).

It would be ideal if these events were also (or only?) input as "event" DB entries, so they could be automatically exported.

This is not critical for this year, as I can just populate the mobile app manually if necessary, but it would be nice to get as much as possible automated for future years.