ICAL calender convertion

I have an ICAL calendar for apartment bookings, it contains an appointment for guest arrival marked IN and a separate appointment for guest departure marked OUT with guest information as part of the appointment text. I need a conversion script which will generate a new ICAL feed with just one appointment per booking (IE the IN and OUT need to be used paired together to determine length of stay and then one appointment generated with a duration time set to the total length of stay. Note there are two apartments in the import feed, "Burns" and "Scott" apartment, each apartment should have it's own output feed, the feed for the relevent apartment should be specifyable as a script argument: Eg: Https://[login to view URL] -> Would return the diary for the burns apartment Eg: Https://[login to view URL] -> Would return the diary for the scott apartment Please see attached feed I have obfusicated personal info. Thanks Tim