WordPress.org

Author: Kaz Okuda

This plugin installs a widget for showing a Google Calendar agenda on the sidebar. Once installed it adds a sidebar widget called 'Google Calendar' that may be dragged into your sidebar. Each widget can be configured with a URL of the calendar feed, a title, and the number of agenda items to show.

The calendar feed is the URL you get when clicking on the XML icon next to 'Calendar Address:' in the Google Calendar settings. See the full instructions here.

Multiple widgets can be used on the same page and each one can reference a different feed.

See also http://notions.okuda.ca/wordpress-plugins/google-calendar-widget/