No, according to the fullcalendar documentation recurring events all need to have the same ID. I went down that path myself though, and manually set the id's. It didn't change anything. Check these 2 pages all I did was copy the output of events.php and pasted it at the bottom of the source code (essentially feeding index.php the same info), but this time the calendar displays the correct information. I changed the date on these to Sept, but just because I got tire of clicking back to August. I produced the same result as when they were August though.