Google Calendar will improve the feature that lets you embed calendars in a site, by adding the option to include multiple calendars, giving you more control regarding the display and the size and adding a week view.
You can embed a calendar by clicking on the small arrow next to its name in the left sidebar, selecting "Calendar settings" and then clicking on the blue "HTML" button. A configuration tool will generate the code.
Google slowly rolls out this update, so you may still see the old version that lets you embed only a single calendar at a time.
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