[iMore Question]

First problem was that google calendar on iPhone was my syncing with other devices. I did various steps you gave and did not work. Then I tried your last suggestion - to delete google account & reinstall.
When I did that, gmail and contacts came back, no problem. But no calendar.
I went through your steps to ensure that calendars are synced, also rebooted device. Nothing...
What to do now?

[Ledsteplin]

Welcome to iMore! I don't know exactly what you have done, but check these two things.
1. Make sure when you go to settings > mail >gmail> Toggle on Calendar. If it's already on, toggle it off and choose delete from my iPhone. Then toggle it back on.

2. Go to the Calendar app. Tap on Calendars at the bottom center. Make sure Gmail is checked.