Oooh, okay. That format is a bit more complex than I had anticipated.
Sadly that PHP project seems to be quite out of date; the phpIcalendar had several security concerns...so so far I'm afraid there seems to be no good parser out there. Sadly my time is a bit too limited right now to write such a parser, especially because I wouldn't be using it on my own.
But I'll try to find time to look out for a parser. And if anyone finds a solit and working parser, I'd be glad to try a simple conversion to HTML. Once that is done, the output to s9y is a snap.
Regards,
Garvin