Lots of people at the FileMaker Developer Conference at the moment!
You might first try to search for iCal in this forum (and perhaps others) to what has already been done. Then come back with specific questions. Perhaps you'll get more available takers?
First time poster here. I recently just got Advanced server and trying to intergrate my filemaker in to ICal. I am looking for someone to help and answer a few questions.
Would anyone be willing to help?
Seed Code has a solution named Zulu that turns your FileMaker solution into an iCal and AddressBook server (you need server advanced). I use the AddressBook piece and love it. I haven't used the iCal functionality as we have an existing solution for that but I'd bet it's solid as well.