Go to Calendar.google.com from there, click on the three dots at the side of the calendar you want to share and then click on Settings and sharing.

Scroll to Share with specific people and click on Add people 

In order for us to upload your data you'll have to share your calendar with Calendar.zenmaid@gmail.com

And that's it, you should see a a line like this if it works in the Share with specific people tab 

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