To sync data between Google calendar with iCal on your mac book is easy, you simply need to follow the steps on Google Support page.
However you won’t be able to invite or email guests to Google Calendar events within iCal if your address is not in your Address Book, you will simply need to add them first. The sync should happen in two ways, meaning, you can either make change in iCal or Google Calendar and the data will be synced to another one.
