My Google calendars disappeared while comparing Fantastical 2 with the built–in Calendar app (iOS 7.0.3, iPhone 4S). I mentioned this before, and somehow “fixed” it:
I think I deleted and re–added the account, and all was well. Temporarily.
After some searching, here are a couple articles that explain why I was tripping:
- “How to enable push Gmail on your iOS device“. You add an Exchange account for push e–mail. I originally set this up while using iOS 5, and probably followed the same steps over a month ago. Not sure why that continued to work until now.
- “A new way to sync Google Contacts“. I was overdue in adding a separate CardDAV account, but was apparently built into adding a Google account process in iOS 7. Also not sure how that worked while I was on iOS 6.
How I fixed things:
- In Settings, then Mail, Contacts, and Calendar, delete my Google account (previously configured as Exchange).
- Follow the instructions from the support page, “Sync Google Calendar with your iOS device“. The notable difference is adding a Google account, not Microsoft Exchange. You can also turn on Mail or Contacts without configuring a separate IMAP account or CardDAV account, respectively.
All Narfed Up 
But pushing mails oder calendar dates isn’t possible anymore, right?
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David: Do you mean event notifications via email? You can check out “Types of event notifications” from Google Calendar help.
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