Right now there is not a R/W calendar system on Maemo I would trust.

You were playing with birthdays's when this happened?

I saw some strange behavior with gcalcli when I tried to view my birthday calendar. Turns out that there are some weird interactions between python, unicode, extended ascii, and the quotes that some applications put in for "soandso's Brithday". Specifically the curly single quote as opposed to the basic '.