How to make iCal event repeat based on Chinese calendar? My MacBook Pro running Yosemite has Finder in Simplified Chinese and iCal is set to show Chinese calendar dates next to the Gregorian calendar dates.

I know how to make events repeat every year on a certain Gregorian calendar date but how can I make events repeat every year on a certain Chinese calendar date (for example, for major Chinese festivals)?
iCal (actually now Calendar.app) is strictly a Gregorian calendar. It shows Chinese dates as a matter of convenience, but it does not actually operate on the Chinese calendar system.