I grabbed the new version 2.20 and added it to our 18.104.22.168 DF, never used the calendar before, so its all fresh.
Adding/editing events seems fine, they are all approved and there in the DB, but only the ones I added in April appear?
Maybe just a setting? the existing events are there fine, but I added events in jan, march, june and october that don't display.
BTW these are all day non-recurring events.