If you have deleted your MTH calendar from google at any point, you will need to re-subscribe to it in iCal. Follow this link for directions: https://support.apple.com/guide/calendar/subscribe-to-calendars-icl1022/mac

If you want your iPhone to automatically update with your MTH calendar without having to sync it to your mac at home, you will need to follow these directions:

http://www.google.com/support/mobile/bin/answer.py?answer=138740&topic=14252

Make sure to follow the link at the bottom of the page for choosing which calendars to sync.

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