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;
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Open settings from the dropdown menu by clicking on the gear icon in the upper right corner of Gmail's main interface.
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Click on the Labs tab in the Settings's page.
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Type Google Calendar gadget in the Search for a lab search box.
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Click on the Enable radio button and the click on the Save Changes button.
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Click on the Gadgets icon on the bottom left of Gmail's interface to reveal the Google Calendar.
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Calendar events attached to your account with minimal configuration options should be displayed.