I read this earlier and try
QList<QOrganizerItem> entries1 = defaultManager.items();
foreach (QOrganizerItem item, entries1) {
if (item.type() == QOrganizerItemType::TypeEvent) {
...

It does not help :-(

how to save QOrganizerEventOccurrence?
I try
QOrganizerManager defaultManager;
QOrganizerEventOccurrence eventOccurrence;

eventOccurrence.setDisplayLabel("test");...