Gmail Lab hosts experimental features that are not enabled by default for all Gmail's users. You can add Google Calendar to your Gmail via Gmail Lab with these steps;
Open settings from the dropdown menu by clicking on the gear icon in the upper right corner of
Gmail's main interface.

Click on the
Labs tab in the
Settings's page.

Type
Google Calendar gadget in the
Search for a lab search box.

Click on the
Enable radio button and the click on the
Save Changes button.

Click on the
Gadgets icon on the bottom left of
Gmail's interface to reveal the
Google Calendar.

Calendar events attached to your account with minimal configuration options should be displayed.

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