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The daily calendar is only showing a subset of the events for a given day.
As an example, the monthly calendar shows all events properly
( See the list of events on 16 September on this page - http://www.commpres.org/events/calendar ).
The daily calender is only showing a subset of those events
( see this page - http://www.commpres.org/events/calendar/day/2012-09-16 )