Google Calendar for Chrome
Google Calendar (Google by) in just one click access to popular Google Calendar, no matter where you're a website that gives you a simple extension for Chrome.
You just click on the icon next to your search bar to check if there are any upcoming event. Naturally, you'll need to link your Google account prior to extension.
A big advantage of the opportunity you are just by clicking the icon to add a new event. Nevertheless, a list of websites that support it, which is pretty limited, at least by now. Apart from this, the extension has been created by Google itself, so it certainly will improve later versions.