It is possible to import iCal calendars into Apple’s iWork spreadsheet “Numbers.” In order accomplish this, you must convert your data into an intermediary format. The comma separated value (CSV) format is an intermediary format that is accessible both from iCal and Numbers. Unfortunately, iCal does not save a calendar file in CSV. You will require a utility application to convert from iCal standard (ICS) to CSV. Once your calendar is in the CSV format, Numbers is equipped to import it. Writer Bio

How to Import iCal Into iWork Numbers - 58