The Bodhi stakeholder's meeting is configured to recur every 28 days. The HTML view of the event on the infrastructure calendar correctly displays the event every 28 days:

https://apps.fedoraproject.org/calendar/infrastructure/2016/12/5/#_

Viewing the text of a specific instance of the event also mentions that it occurs every 28 days:

https://apps.fedoraproject.org/calendar/infrastructure/2016/12/5/#m4671

However, the ical interface lists the event as weekly:

$ curl https://apps.fedoraproject.org/calendar/ical/calendar/meeting/4671/
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//PYVOBJECT//NONSGML Version 1//EN
BEGIN:VEVENT
UID:20161129T154616Z-29480@fedocal02.phx2.fedoraproject.org
DTSTART:20161011T150000Z
DTEND:20161011T160000Z
LOCATION:fedora-meeting-1@irc.freenode.net
ORGANIZER:bowlofeggs
RRULE:FREQ=WEEKLY;UNTIL=20251231T000000
SUMMARY:Bodhi stakeholder's meeting
END:VEVENT
END:VCALENDAR

This seemed to have changed recently, as I noticed it just today in Evolution which is now rendering the event every week (which caused me some alarm today as I thought I had another week to prepare for it!)