Step 4. Now navigate to Google Calendar and click on Settings in the top right.
Step 5. Click on your name under Settings for my calendars in the left nav.
Step 6. Scroll down to Other notifications, and check the box that says Allow responding to invitations forwarded through alternative email addresses.
That’s it. Now people can send you calendar invites to your hey.com email address and it’ll show up on your existing Google calendar.